Removing old 531 frame bottom bracket. Where to source a pin spanner etc I've been riding a vintage 531 frame bike which I've stripped and rebuilt. However, I'm having problems with extracting the bottom bracket. This has some play in it, so I really need to remove, regrease and replace the bearings. I've managed to free up the lock ring with the help of a chisel and lump hammer (to give you an idea of how frozen it was) but I cannot now remove the bearing cup as I need the correct pin wrench tool. Has anyone any idea where I might buy a tool for such an old bike in the UK? There are 4 pin holes approximately 2cm (13/16ths)apart. The pin holes are approximately 2mm in diameter. The ones I've found that are readily visible on amazon etc are adjustable, but are for larger pin holes.
Non-cycling-specific pin spanners do indeed tend to have fatter pins, but in the cycling section you should find something.
Park Tools SPA-2, for example, has pins just over 2mm diameter (so you should check), and the spacing is adjustable over a small range about what you need because its a little springy. I bought mine for working on a 90s Raleigh; they're not needed so often on modern bikes.
Hopefully you'll need less force than to remove the lock ring, as it's not a massive tool.
Alternatively it's possible to measure the spacing of an opposite pair of pin holes and make something from scrap metal using M2 screws as pins. That's only worth it if you've got all the tools and materials to hand