Shutter problem in Mamiya-Sekor C 1:3.8 f=127mm for Mamiya RB

This Mamiya-Sekor C 1:3.8 f=127mm for Mamiya RB had some Shutter problem, and it was because of old sticky grease in the advance and shutter gear, I clean it with some Isopropyl-alcohol 99% and relube very, very little on the gear ring, and the lens was back to working order. To disassemble the lens, you need some tools: This is the type of the rubber tool I use from Amazon: Those are the cone rubber tool to unscrew the lens name p