• PVC Conduit - As close a fit as possible to the U part of the lock. I got a suitable 2m length for £1.70 from B&Q
• Hose clamps - 4x 10mm and 2 or possibly 4 x 22mm (sizes will vary according to your rack & lock diameters)*
• Bits of old inner tube or other material to make shims
• Zip ties - 2
*The hose clamps need to be reasonably robust I initially used some from Aldi which were soft and thin and not up to the job. I got some more substantial ones from Screwfix which seem just fine.