CVA Optima - retighten butstock?

[Ed Smurf]

I have a CVA Optima muzzeloader that has got me a few deer. The butstock is loosening up. The adjustment is an Allen set screw in the front part of the stock...really deep. Looks like a difficult place to work in as it is not a straight line , will probably need some kind of u-joint to get in there. I can probably manage that if I knew what size of allen head it is. Since it is a made in Spain firearm....I assume metric. Anybody done this before?

 

[Dsiwy]

My stock has the screw under the grip cap, maybe check if you can access it better that way.

 

[Ed Smurf]

I checked...pistol grip removal shows nothing .

 

[RifleDude]

How about a flexible extention shaft with a 1/4" socket at the end for an Allen bit and use your drill to tighten the stock.

 

[Ed Smurf]

That would work...but I need to know the bit size to use...right now I can only eyeball it and can't get a bit on it to get the proper size.