s+w M66 main spring / strain screw?

A

Ammo Junky

New member
I have a M66-1 that is misfireing. I plan to instal a wolf mainspring. My question is how much tension do I put on the strain screw? Just snug? firmly tight? Tighter than hell plus three more turns?
Tia
AJ
 
If the screw is not tight with the factory spring it may be causing your misfires. The strain screw must be tight. If someone has shortened the screw it can cause the same problem.
Bill
 
As I was abruptly told by an aquaintance, "screw the (dang) thing in all the way and leave it alone!". Considering FTF's seem to occur when fiddling with it, i'm inclined to agree...
 
strain screw adjustment

After you install the Wolf parts you can adjust the strain screw to your liking by screwing it in until it takes a good set. Shoot it, If it feels fine leave it. If not, back off a turn and shoot at least 12 rounds if it goes bang and your happy with the way the trigger pull feels leave it, if not back off a little more until your satisfied. Try different ammos If no misfires occurr your good to go. If you get some misfires tighten the screw until none occurr.
 
If the screw is not tight with the factory spring it may be causing your misfires.
Click to expand...

Yep, that was it. :o

The only expereince I have had with leaf type main springs is in singe actions where you just tighten the screw down and that is it. From now on that is how I will deal with the m66 type as well.
Thanks
AJ
 
Please listen- The strain screw on S&W D/A revolvers should ALWAYS be screwed down tight! If it is not tight, the screw can back out, causing misfires. Never "adjust" the strain screw.
Bill
 
Exactly RIGHT.

The S&W strain screw IS NOT a trigger adjustment screw.
Per factory specs, it MUST be screwed down TIGHT and must stay tight.

Failing to keep the screw down tight will allow the screw to back out under recoil, WILL cause misfires and can cause the mainspring to "knuckle".
 
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