This is simply the Norden leaf table with some leg extensions and casters, used as a conveniently storable table for tracing out patterns and cutting cloth for home dressmaking.
In total the table is raised 16cm. It is important to get casters with brakes so the table doesn’t move in use. I used some steel brackets which have a screw about 6mm diameter fixed to them, which goes into the extension piece. I drilled two holes right through the legs and used 2 X M5 countersunk bolts secured with nuts because I thought wood screws might tear out. This wasn’t enough to keep the extension pieces from pivoting slightly, so I added some plates secured with wood screws. The end result is not elegant but is acceptable for a workbench. The hack could also be improved by using smaller casters which would have room to swivel properly.