Don Phillipson wrote:
(Plastic) wheels seem to have seized on a Scott brand
spreader (possibly product no.10590016 on the Scott
web site which offers no information.) This is the gadget
for which the wheels turn a cogged cylinder (only when
a hand lever is held down) to release fertilizer or seed
etc.) What advice for maintenance?

You have to hose these things out thoroughly after every use to prevent
corrosion.

A little oil on all the bearing surfaces might loosen it up.