Easy: drill 5.0mm hole in top above ball-spring, tap with M6 tap and install M6 bolt with lock nut. Install with loctite
These are/were the original bolts: 22.0 mm shank length. I need 2mm more (i.e. 24.0-24.5mm).
I do hope the ordered bolts are the correct length, but how could they not be?