That is not an easy thing to do with the gearbox on a bench so going to be very hard with it in the car.

I had to put a lot of heat into the bolt then shock it with lots of cold water to get it out.

Then had to use a puller to get it off the shaft.

I think the new rubber boot

£13.35
Designer for turbo set ups on F1 cars, and Nitrous Oxide Systems of the USA in the 80s