"Pat,
where did you get these casters? i really like them and especially because the lever
is made of metal, so many are plastic these days.
did you make the aluminum mount?"
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Swivel/lock casters from Caster City.
Mending plate (aluminum) provides threaded hole for studded caster and crosses the joint to weld-up the corner. Yep, plate was culled from 1/2 MIC6 Alum. scrap, routed to size and drilled & tapped x me.
An indestructable connection.