Floppy mirrors!

I have recently bought a lovely 1998 750 Supersport in nigh on showroom condition, it still hasn’t done 5000 miles and I have actually put a thousand on it since July. It runs very well indeed but I’m forever having to adjust the mirrors as they won’t hold a setting. It looks like a lopp eared rabbit! Does anybody know if they can be tightened up or have a workable fix? Thanks, Martin.

I think from memory, remove them off the ball, scuff up a bIt and it stops the droop