Now mind you, I'm rather early on in my shutter studies and work. But it's becoming more evident that spring replacement is the correct remedy for getting these shutters back to speed--the Betax. Rapax, Compur, etc. This of course is leading to the need to learn spring fabrication, since no parts I know of are available.
If regular users are going to do the naptha-related tricks to get a dead shutter at least working again, then fine. But if you are not following it up with a little tester, so you can make a conversion chart to stick on the back of the camera, then you still don't have much of nuttin'. You'll be all over the place on finding film speeds and development times. Banging your head against the wall.
Find out where your shutter really is, and the rest of procedure will start clicking into place. Voice of experience.