I took it upon myself to mod my jack trolley into a smoother and quieter operation. That is, fitting some giant 125mm polyurethane/nylon wheels instead of the puny aluminium castors at the back.
The only issue is to get the brackets turned on a lathe. How would you rate this job difficulty wise and how many hours labour would I expect to be charged for it?

The only issue is to get the brackets turned on a lathe. How would you rate this job difficulty wise and how many hours labour would I expect to be charged for it?
