I already have an Apex pin installed in my 66-7.

I tried installing the Wolf Type 1 spring kit (or whichever one is “duty” rated.)

I like the trigger pull, but it is not completely reliable with magnum primers. About 17% fail to ignite when shooting double action, even after double-seating the primers. This holds true with factory magnums as well.

Is there a firing pin that’s maybe a hairs-breadth longer than the Apex?

I know Powers Custom makes long firing pins for "hammer nose" firing systems. I don't know about frame mounted firing pins. I think maybe TDK does.

I like the Power Custom firing pins for both old and new systems. If the current firing pin is over .495, a longer one won't help any unless you have excessive headspace (not too common). You need more spring power. I would try a Wilson mainspring. Those give the best combination of hard hit and light trigger pull of all the aftermarket ones.

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I like wolf springs for the most partbut the ribbed main spring usually needs a longer tension screw .other main springs are flat(no rib)and work with original tension screw. your tension screw is probably setting in the rib of the wolf spring.

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Thanks.

I ordered a pin and extended strain screw from TK.

I have always used a stock mainspring and adjusted the tension screws length so that when tight it is 100% reliable. I used to get all into polishing and smoothing the spring.

Back off the factory screw until you get miss fires, turn it in 1/4 turn at a time until you have none. Turn it in until tight counting the number of 1/2 turns until tight tight. Measure screws length and then take away .016 per 1/2 turn. Leave 1/2 turn of length. You can always file off more, you can't add any. You can buy all the blue or stainless 8-32 screws with the correct head from an Ace Hardware that has the gun screw trays.

Best choice is to use the real S&W mainspring and the real S&W firing pin. Tighten the strain screw all the way down. If you still get misfires, send it back to S&W to check for out-of-spec headspace. Get rid of all aftermarket parts.

This is the way! That is the proper way to do it. When I attended Smith Armorers School we were taught that. No new parts necessary.

Cheap Ammo wont fire all the time with the springs and firing pin combo. If you shoot Federal primers you won't have any problems. I have a 686 with a 3.5 pound double action trigger pull and it fires every round. Hope this helps.

FWIW, the TKC pin is shorter than the Apex that’s already in it.

I have a factory spring that I bent very slightly, but it’s not balanced, it has a catch about midway through.

Update: I installed a slightly slimmed-down MS and switched back to the original strain screw.

Pull weight averaged 10lbs.

Backed out the screw 1/2 turn and it dropped to an even 9 lbs (my Timney gauge isn’t digital and has 1/4 lb graduations)

I realized the roughness was from the weaker Wolf rebound spring. All is smooth following the adjustment.

Range test coming.