Morning all,
I'm still working on it.
As mentioned I'm not the world's best handyman but have now stripped the surrounds down to the shaft with a circular housing remaining by drilling holes in the bakelite surround. Once I "joined" the holes drilled, I was able to dismantle the housing. Please refer to two attached photos. The gap between the base of the surround and the "dashboard" is 10mm or 1 cm thick. My immediate problem now is that neither a 75mm nor 100 mm gear puller arms will fit so as to allow me to pull the remaining housing away from the "whole." As a layman it seems to me that the larger the dimensions of the puller the less likely the "grippers" will fit between the bottom of the housing and the "dashboard. Apologies for the strangled language but that's the best I can do. Ultimate question is ...am I on the right track or right out of whack? An alternative already suggested is that I use a grinder and remove it that way.
Angry51 suggests the 150mm would be suitable but as I've indicated I am unable to fit the 75mm or the 100mm so I don't see how the 150mm would fit. By the way, I've applied WD40 liberally to no effect.