I was trying to sight in the 686 and stupidly adjusted the sight too far to the right. I don't think I broke the screw, but now the screw won't turn either way. Any suggestions?

Apply heat gun(or hair dryer) and soak in penetrating oil(WD40 will work). If it breaks just order a new screw & nut from S&W. The screw head has a very small plunger & spring in it. Don'y loose it!

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S&W Accumulator

Thank you Mike. That did the trick. Really appreciate it.