What's the deal with new strain screws?

[stantheman86]

I installed a new "domed" strain screw in my 15-7, and the trigger pull became very tough and the return sluggish.

I noticed that even in new Smiths, the strain screw is flat on the end.

Do these need to be "fitted" or filed flat? I don't get why they dome the tips only to file them flat at the factory. I don't think the pressure of the mainspring can flatten them that quickly.

I also pulled the stainless strain screw out of my 64-7 and it was mushroomed, do they do this to a certain point and then stop?

 

[chief38]

Depending on WHERE you bought the Strain Screws from will determine their exact dimensions. I too have noticed that different sources make them (or buy them) to different specifications. The last time I got a batch in, I sent them right back as they were NOT the OEM Factory specifications. Caution and attention to detail are the words when looking for parts.

 

[ontargetagain]

At the angle the strain screw contacts the mainspring 'flat' vs 'rounded' likely won't make a difference. The pressure it applies does make the final determining factor and there does seem to be variances in length between revolvers of mine.

The other day when I spoke to the folks at Wolff Springs they told me the are going to be offering strain screws too, I would imagine them to be of good quality so I may get a few from them, they may be a little longer to allow 'tunability' with their springs.
Karl

 

[backer]

I believe they are domed so they can be shortened without damaging the threads.