I have had two mics modded by Michael Joly at Oktavamod. It's quick and painless. They schedule your mod date far enough in advance for you to ship it to them. They mod it and ship it right back. Well worth the money. They also sell new mics here: Award-winning microphone engineering from Michael Joly
Last year you could buy Michael Jolly mod kits for Oktava 012's on Ebay. Opened the sound up like you wouldn't believe. I also did a pair of Apex 205's, great stuff. You won't regret having the mod done, Michael's a f-ing genious.
I just had a look at his web site.
Based on one of the reviews, I put a bid on a mic in E-bay which interests me.
If it turns out to be a bummer, I'll get M. Joly to modify it.