Thank you, I wish it were a push fit but it's a lump of homemade stainless pain in the ****
Ah! Sir is having a hard day!

This might cheer you up? There’s always someone worse off!
https://youtu.be/Mb0qRuBYiIg
Thank you, I wish it were a push fit but it's a lump of homemade stainless pain in the ****

A sharp dot punch (60 degree point) and a good whack! Damage can be hidden at bottom on refit with copaslip. And good luck with it.
What I recall the previous owner had said that they had an o-ring so hopefully they will come off eventually.

Sod drilling and farting about on a simple push fit cover.... looking at your picture you should be able to lever the cap off with a flat bladed screwdriver or small bolster chisel. It's not a delicate piece of china, it's a heavy metal object.![]()
I have tried a screwdriver and a chisel but failed they are stuck propper and may even be almost solid stainless, perhaps i need to go to the bigger hammer drawer. My fear is doing damage to the frame.
Yep, that’s a slide hammer, one of the caps to the left of the handle will have a hole so that you can tighten a self tapper to the hammer, there are even some suitable looking screw type things to the right of the handle
These are usually used by panel beaters for pulling dents out etc and by scrotes for pulling ignition barrels out before we had start/stop buttons![]()
That type of slide hammer is a but crude,
Modern ones have a semi blind cup/ hook arrangement that plastic type nipples fit into.
You apply hot glue to the nipple end and glue it to the panel you want to pull, hook into the puller and either use the weight to its full extent or gently to lightly move remove small dents.
The nipple come off the panel one a small amount of iso/ water is applied
They used to use the same technique but with what looked like nails that you would effectively spot weld to the panel
If you can't find a swingarm bolt I'll send you a pair for cost of postage.
They're on their way there. (couldn't resist that sentence)