I have a bsa M20 spare gearbox and want to rebuild it. The inner cover is missing a piece where the bearing is placed, but on which the bearing does not rest. I have a question: can I use this cover without any problems or do I have to look for another one? Thinking e.g. to the oil level inside the gearbox ....? I hope someone has an answer for this problem.
Hi Andre, as long as the retaining washer 24-4236 that goes behind the bearing is held in place by what is left of the cover, all should be OK. The retainer is necessary (along with all the components) to maintain end float on the main shaft. Oil is not an issue as oil already flows from the inner case to the outer case via the hole on the right hand side of your photo above your letter "N".