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Free FX Impact barrel lock down screw mods

Forums PCP Airguns Free FX Impact barrel lock down screw mods

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    Profile photo of sniperlabyo
    sniperlabyo
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    PM me if you want one for free, have only 4 as of now till more oring arrive. 

    also the washer prevent the oring from expanding outward and provide even compression. 

     

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    Profile photo of X27
    X27
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    Nice

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    Profile photo of SNOWBOARD223
    SNOWBOARD223
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    Great video. This is a great way to resolve issues with the over tightening of the thumb screw. Keep making video’s!!!

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    Verve
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    Thanks again Ernest … Been using a PUR o-ring but your setup is precise and thanks for the measurement. 

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    Paio
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    Thank you!

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    Profile photo of 7deuce
    7deuce
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    Hmm. This might solve the minor issue I’ve been experiencing. My probe rubs inside the magazine on the rotating gear that holds the pellets. I can’t wait to get home on Monday and try to loosen it a touch. 

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    RossBrown
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    Great Ernest, thanks again. I removed my OEM thumb screw and replaced it with an Allen headed grub screw which I torque down each time with my Fat Wrench inch/pound torque driver to achieve exactly the same tension on the barrel each time to avoid the possibility of the barrel moving to the left and contacting the pellet probe. Also as you point out the thumb screw only needs enough tension to prevent the barrel moving forward as the locating notch at the end of the barrel prevents the barrel rotating and misaligning the transfer port. The problem is applying the same pressure each time the barrel is fitted, to maintain consistency in POI and probe to barrel clearance.
    So far I haven’t had the grub screw come lose, but I may be over tightening it and causing slight barrel/probe misalignment.    

    I like your idea of the outer delrin washer to contain the Oring preventing the Oring over expanding outwards when the thumb screw is tightened down reducing the Orings effectiveness in maintaining resistance the prevent the thumbscrew loosening. Also the Delrin washer’s thickness can be varied so that it limits how far the thumb screw can be tightened down on the barrel, also preventing barrel/probe misalignment and possible POI change from over tightening, yet the Oring preventing loosening.
    Thanks again Ernest, it’s a great idea.
    Ross

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    RossBrown
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    Ernest another way for FX could fix this thumbscrew loosening problem on future guns would be to make the thumbscrew length exactly that required to apply the correct tension on the barrel. Then cut an Oring grove on the inside face of the thumbscrew head and fit a large diameter Oring in the groove. A larger diameter Oring would give plenty of surface area to grip and reduce the chances of loosening. Just a thought.
    Ross 

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    sniperlabyo
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    ok got 10 more to give out, pm me with your addy

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    Profile photo of sniperlabyo
    sniperlabyo
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    Update on other impact owners.

    One thickness washer will not work for every impact, if you have barrel movement after tightening down the screw, you can sand it down till barrel don’t move,  or just use the Oring.  

    also notic on my 2nd impact it needed a thicker shim.

    so make sure your barrel is tight with no movement with the shim I gave away.

     

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    7deuce
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    The shim you sent me works great. The barrel screw stays nice and tight. Thx again. 

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    SethAZ
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    Thank you Ernest!

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