I have used traditional locking casters on my workbench before and it was horrible. This made my workbench still portable, but (when powered off) perfectly stable. I have absolutely no regrets installing them. I stacked two 2x6 lumber to make the legs and then attached them to the (flat) underside of my workbench and they are very strong in this configuration. The only remaining problem is that lifting individually is a bit difficult and can cause torque on the base. I deal with this by pulling up two at a time (or down two) but others seem to have connected the sides together with the crossbar so they work simultaneously. However, this is not difficult to manage and can be done slowly (to minimize bloat) so this is not an issue.
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