Did some thinking today and I'm actually pretty glad I didn't get any paint down yet. Inside the rear section of the case are two bearings with a shaft that runs through the centre.
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The bearings are fixed in place with circlips on either side (two external on the shaft and two internals in the case). From what I can tell I'll need to put one of the bearings on the shaft with its external circlip in place, drive it into the body until it's against the inner circlip and then repeat the process for the other side with the shaft already in the body.
First problem is getting the bearings on the shaft, I know I can heat them up on a light bulb to make them expand for an easy fit but I'm a little worried about how I'm going to get them seated in the case. My bearing drivers don't fit over the shaft and I'm a little bit nervous about driving them in using less delicate methods.
Thinking about making up some 4" thick drivers out of wood with an appropriately sized hole in the middle for the shaft but I thought I'd ask here to see if I'm missing something. I also considered heating up the case with a propane torch to make fitting easier but I'd need to buy one and money is tight at the moment (stupid cars, don't ask haha).