I can second jnantz's recommendation of Carol Miller at Flutot (flutotscamera@earthlink.net), though I think she is pretty backlogged: I've been waiting to get to the head of her queue for about a month. Zachs Camera Repair is working on one of my Prontor SV shutters right now - the estimate is $125 plus S&H for a CLA and slow-speed train repair. I haven't had experience with them before, but they came highly recommended.(
zackscamerarepair.com)
I recently fixed a misbehaving Pronto (almost impossible to turn the shutter speed selection ring) by removing the upper plate and speed ring, removing the solidified grease from their common surfaces, and applying a very light film of lithium grease. Problem solved. Speeds are still off more than I'd like, but I choose not to take on disassembly of a shutter more complicated than the fix I just described - too many experiences with leftover parts after applying a carburetor kit. If you feel more daring, there is a downloadable repair manual
here.
On the cautionary side, I recall reading that indiscriminate soaking with naptha can damage some flash interface components on some shutters. Yeah - pretty vague.
Good luck!
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