Tasco Custom Shop problem

Discussion in 'Hunter (HFT) & Field Target (FT)' started by skires, Feb 15, 2014.

  1. skires

    skires Well-Known Member

    Joined:
    Apr 28, 2009
    Messages:
    1,139
    Bought this years ago s/h and never used it. Seemed cheap at the time.

    Only used it about 4 times.

    I put it on a 77 for FT.

    The problem is the focus sidewheel. The outer part of the original small sidewheel keeps coming loose. I don't know if this is because of the recoil or just with using.

    There are 3 equally spaced very small grubscrews that have a flat screwdriver head ( these are @ 1mm diameter and 1mm long ... so small ). 2 out of the 3 seem fine ... the thread on the 3rd seems wonky.

    When you remove the 3 grubs the outer part of the wheel then unscrews off. You can then undo the grubs on the inner ring ( with the numbers on ) and remove that if you wish.

    The outer diameter of the outer part has a narrow knurled surface. This sits slightly proud. It's this knurled surface that the large custom sidewheel sits over and that itself has 3 grubs that tighten to hold the custom sidewheel in place.

    So it seems that the 3 grubs on the outer part fail and when then trying to focus with the large custom wheel the original outer turns but the focus doesn't change.

    I've tighten those little grubs up as tight as you can but they keep failing.

    This looks all alloy.

    When you screw off the original outer part you can see that it screws onto a very fine thread.

    I believe that no one repairs these any more? So it seems like a home repair job or nowt.

    So I suppose any fix is worth trying before binning it. It would be nice to be able to undo whatever I do though.

    So would it be possible to put some blue threadlock on that very fine alloy thread and screw the outer bit back in place. The blue is supposed to be 'manual tool' removable. I don't fancy it on 1mm dia 1mm long grubs with a very very tiny single slot drive on top ( Jewellers screwdriver to remove ) as it may be too easy to wreck the tiny slot.

    I'm hoping that some blue on that thread and screw the outer piece on may work as I could get some grips ( with protection padding ... although that knurled area is a mess as it is with all the custom sidewheel grubs over the years ) on the diameter of the outer bit to try and remove.

    I'm not fancying heat on a scope to break threadlock.

    I suppose the other option is the bin and I can't see this ever being opened up again internally. So if it has to be 'welded' on and never to come off then at least I can use it until it dies and then bin it.

    The other option is to just lock up the grubs tight again and use it on a pcp and see if it's use or recoil that's loosening it. If it holds on a pcp then it's a pcp only scope.

    Any other suggestions please?

    PS Just to clarify ... there is no actual play in the focus mechanism. It's solid and works perfectly. The problem is just the very outside part of the sidewheel assembly that screws on and then is held with 3 small grubs. Take that off ( or when it's tight ) and the focus sidewheel has no play and is smooth and works perfectly ... but I need that piece solid so the custom wheel with the markings on will turn the focus. This is the outer part that when you remove you can then see ( side view ) the fixings to then get into the scope.
     
    Last edited: Feb 15, 2014
  2. Akita

    Akita Member

    Joined:
    Sep 26, 2013
    Messages:
    192
    Location:
    UK
    Club:
    Greyhound & Purley Chase
    mines doing exactly the same thing on HW97 could it also down to cold with those tiny grub screws, never had an issue with it on pcps or TX200
    A good friend has made me a type on boss with 6 offset grub screws that will fitt ove the outer and inner part and bite down on both parts hopfully locking them together, then the end is turned down for the side wheel to fit on.

    I will let you know how it works.
    Edit - also the only grub on my outer part the thread is stripped.
     
    Last edited: Feb 15, 2014
  3. skires

    skires Well-Known Member

    Joined:
    Apr 28, 2009
    Messages:
    1,139
    Many thanks for posting that. I see what you mean.

    You are right ... I've checked ... the 3 grubs are on the inner ring with the numbers on. The outer, knurled edge, part has the 1 grub. Mine still has thread but it's not holding.

    Maybe I could get that drilled and threaded at another 2 points and then there are 3 grubs holding the outside.

    That inner ring can come off all together. It's there so you can set the distance on focus by loosening those 3 grubs and turning it until the numbers line up with your focus. It's not used at all so I could remove that and have a bush made up that fits over the solid unit and the outer bit. Grubs can hold that in place and the custom wheel goes on the outside of the bush. In fact the outer screw on part can go as well and just make a new cover that sits over the sidewheel area and has a closed end.

    Still relying on grubs though so they may work loose.

    Good luck with yours.

    I suppose the grubs on the new bush could be slightly bigger and be Allen head so a drop of blue threadlock could be used as the grubs should be able to be removed with an Allen key.
     
    Last edited: Feb 15, 2014
  4. Akita

    Akita Member

    Joined:
    Sep 26, 2013
    Messages:
    192
    Location:
    UK
    Club:
    Greyhound & Purley Chase
    Had a days shoot with the new bush/boss and so far its doing the job, it locks the out the nurled part and the inner together so the nurled part doesnt come undone.
    Im shooting the HW97 more often now so will let you know how i get on.
     
  5. skires

    skires Well-Known Member

    Joined:
    Apr 28, 2009
    Messages:
    1,139
    Cheers for posting again.

    I tightened up the knurled part and the 1 grub again. This time I moved the custom wheel inwards and locked it against the inner ring that has the 3 grubs. It's all solid at the moment but only tried a few pellets up the garden.

    I'll try it tomorrow ( decent day forecast ).

    I'm quite happy now though that if it keeps going I can have a bush made up that will replace the inner ring and the outer knurled part ... so one way or another this will be fixed.

    Good luck again with yours.

    Col
     
    Last edited: Feb 17, 2014

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