My welder a 30+ years old transformer machine was too heavy for my age
so I decided to attach two extra wheels at front with a removable steering wheel
to make my life easiest.
The machine now can move at front or back or turn around very easily.
At first I replaced the factory wheels at the back with two bigger heavy duty solid rubber wheels with cylindrical ball bearings
keeping the back old wheels to use them at front.
All other materials that I have use are from old left over items and metal scrap.