Sako P72 Finnscout trigger screw

Discussion in 'Sako Rimfires and Small Action Rifles' started by chuckb, Aug 6, 2019.

  1. chuckb

    chuckb Member

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    I lost my small trigger adjustment screw and need a replacement. It is screw number 2 in the diagram.

    Update -- I have located a screw. It is a 3.5mm.


    [​IMG]
     
    Last edited: Aug 12, 2019

  2. paulsonconstruction

    paulsonconstruction Sako-addicted

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    Take out screw #3 & try it in screw #2's hole. If it is the same thread take it to a store that sells small specialty screws. In my area it is Ace Hardware. Find the right diameter & pitch. It will be a metric thread/pitch. From the pic, I'm guessing it's a 3mm. You can check the pitch by trying some nuts on it at the store. You might have to cut to length or modify it or take it to a gunsmith if you don't have the tools or skills. I found an overtravel adjustment screw for a Sako #4 trigger at Ace that was a perfect fit. Only difference was it took an Allen wrench to turn it instead of a screwdriver. If screw #3 doesn't fit, take the part of the trigger that screw #2 fits into to the store. The Ace I go to would have this screw for sure. Good Luck!
     
  3. stonecreek

    stonecreek SCC Secretary Forum Owner SCC Board Member

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    The big home improvement stores keep a limited selection of metric screws, as does Tractor Supply. I don't know if they go down this small, but lacking any other source you might try one of those. If you're in a major metro area then you can usually find a specialty fastener supply store which would almost certainly have such a screw.
     
  4. chuckb

    chuckb Member

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    Thanks. I took my rifle to the Fastenal store and the clerk determined that 3mm was too small and 4mm didn’t thread.
     
    Last edited: Aug 7, 2019
  5. paulsonconstruction

    paulsonconstruction Sako-addicted

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    It's probably a 3.5mm diameter screw. Pitch is probably the standard for that diameter which is .60. The guy at Fastenal is probably limited in his familiarity with metric sizes if he doesn't know there is a 3.5mm diameter screw & sold you a 4mm tap you don't need. You can't run a 4mm tap in a 4mm hole with different threads or you will botch your trigger up. Look for a 3.5mm x .60 screw (they're readily available as that is the size I found for my #4 trigger at Ace) before you start drilling & tapping a trigger part you can't replace if you screw it up. Just sayin". PM me your contact info if you can't find one, as I have several screws that size. If you know the length, I'll send you one.
     
  6. chuckb

    chuckb Member

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    I think you are correct. Fastenal didn’t have any 3.5 mm screws in stock and said they had no problem with me returning the 4mm tap and screws. Thanks for your helpful information and offer. I will try to find a 3.5 mm screw.

    The smallest size my local Ace Hardware carries is M4.
     
    Last edited: Aug 7, 2019
  7. douglastwo

    douglastwo Well-Known Member

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    Chuckb, you might find the attached metric "cheat sheet" could come in handy when hunting for Sako screws/nuts.

    Metric Screw Size.jpg
     
  8. Aussie B

    Aussie B Member

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    Can anyone tell me what the screws marked 1,2 and 3 in the photo do? Thanks
     
  9. stonecreek

    stonecreek SCC Secretary Forum Owner SCC Board Member

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    I'm not familiar with this trigger even though I have three P72/M78 rifles as there were apparently three different triggers used on this model, which seems odd for a rifle produced in relatively low numbers. However, screw No. 1 is definitely the mounting screw and should be tight and locked with the nut. Screw No. 2 appears to be the trigger sear engagement adjustment; and screw No. 3 appears to be the bolt sear engagement adjustment. Adjusting either sear engagement (particularly the trigger sear) can be tricky and should be left to a competent professional.
     
  10. Aussie B

    Aussie B Member

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    Many thanks for your help.I have posted a new thread
     

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