I posted this in the smithing section but thought I'd shout out here just in case someone may have one laying around. Midway & Brownells are out. Darn thing just walked right off my bench.

I recently bought a screw set off ebay for a model 13. It came with a spring which I believe is for the locking block. I don't need it. It is indeed actually laying around.

Here's the item:
Smith Wesson 8213 13 K Frame Model 13 2 Screws 3 Each and Spring Gun Par | eBay

If that would work you may have it, I could just mail it to you.

Thanks for your very kind offer. Unfortunately, that's not the spring. Pic of spring is attached.

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Oops. I was wondering but thought you were talking about an old M&P revolver.

Would this work? This is a great place for parts.

M&P 9/40/357 & Compact Take Down Lever Retaining Wire [1755] - $3.30 : Welcome to Speed Shooter Specialties

I was able to order one from Speed Shooters Specialties.