I recently acquired an Exakta V, serial number 681145. I am attempting to disassemble to perform a clean and lube. I am stuck at the removal of the rewind button - see red circled item in pictures. This button must be removed to access and remove the rewind idler gear shaft, otherwise the camera's shell cannot be separated from the chassis. This rewind button will not pull off. Nothing visible is obstructing it and I have applied quite a bit of force. It moves up and down freely in its normal function. It feels like something is holding it in place but I cannot find that something. I have Miles Upton's Ultimate Exakta Repair but his book is based on the VXIIa version and that version uses a simpler rewind button. I have done a clean and lube on four other Exakta Varex cameras but this is my first V, and that darn rewind button has me stumped. Any advice?