If none of the above works, knock the pressure plate out of it. You can have it out in less than half day. No need to remove the lid. Take it to a re-builder, tell them you're not interested in a 23, 25, or 28 hundred or even 3000 lb force plate springs. I can build one with 1800-2200 that works smooth as jelly & handle normal horse power. We've taken these plates out what have 3200 and MORE lb springs. Ridiculous.
Pantera Miami