It looks like Michiel has already dressed one of the loop posts with a grinder?
I've been very grateful for that tool. It was the spring loops on my B30 that squeezed up a bit. I thought it was the same spring as an M20, but maybe the loops are lighter or smaller??
Untill I made a similar toolI used to fit the spring first then fit the stand to the bike
That way you can use the actual stand for leverage
Still not an easy task but does work if you do not end up pulling the bike on top of you
I have done it with the bike on the front stand and with the bike on a jack .