I have an old 10-speed bike (presumably 80's vintage). I'm trying to remove the bottom bracket and cranks but have struck a problem.
The crank bolts have a plastic cap over the top of them and I'm not sure how to remove it. They look like they should unscrew based on what I could imagine it would look like before they were trashed by the previous owner. I tried to unscrew them gently but they didn't move and as you can see from the photo below they're very fragile.
On the other side the cap has been completely broken.
I can see a nut, but with the plastic cap extending into the cavity I can't get a socket in there. I need to remove the plastic somehow.
Anyone have any ideas how to remove the cap and it's remnants?