Well, as of last night I have declared the "soak in naptha trick" to be worthless, and began disassembly of my Graphex-X shutter (which is not exactly like the online material for Graphex). The only way I can hope to be happy with the accuracy of all my speeds is to get this thing all apart, cleaned, lubed properly, and back together again. Wish me luck. I think I can get it done without some spring flying across the room ending up in the upholstery never to be seen again.