I've changed two pulleys on my R75, one original which failed after just over 60k miles and then again after stupidly buying a cheapo on Ebay which lasted 4k only. I am a retired engineer and had the same problems as you, I have a pretty comprehensive tool kit but nothing would move the pulley bolt - in the end I hired a 1000Nm impact wrench from HSS and that did the job both times. But!!! the wrench is for professional use so 110v so you need to hire the transformer as well all in all costs about £65.
The pulley just failed again, a Corteco which lasted again just over 60k miles, same as original, this time I purchased a new pulley and then enquired of my friendly garage in Chester, I know the guy fairly well and he knows R75s he does jobs I either don't want to do (not many!) or when it is winter and I don't fancy being cold and wet under the car for hours! He said £75 cash, he took 2 hours maximum, which for me it is best part of 2 days under the car on my back and at 73 years that is a no brainer and only £10 more than the hire equipment. He, of course, has all the gear, a large windy impact wrench plus car up on ramp for easy access and someone to help when needed.
Sometimes doing it yourself is good and enjoyable but I think I have done my last DIY R75 pulley change!
Brgds Dennis
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