Just wanted to get some input on the type of casters to get to replace
the ones on my upright piano.  They are old and rusty and do not move
very easy.  Can I use medium or heavy duty (able to support 400 lbs.)
casters that are in a hardware store?

I have several piano part catalogs to order from but the choices are
many.  My piano will be resting on a wood floor.  Any help would be
appreciated.

Thanks.
Marc Finlen