Do you guys have an MXL 603S, 551, or 991 Microphone upgrade it with this kit

Hi All , if you guys have one of the microphones listed above do yourself a favour and get yourself this $100 dollar upgrade kit.
I've used a couple of this companies kits mods and diaphragms . Always found them helpful instructions and photographs are clear
Customer service second to none. Our going to need some soldering skill and an hour or two to complete.
http://microphone-parts.com/mod-kits/mxl-603s-mods/

Enjoy
Kimball