John Moorhead wrote:

snip long tale of woe wrt Sears and service/support...

A. (Disappointing installation of washer/dryer)...

I'd have told 'em to come get 'em and get refund and go somewhere else..

B. (Couldn't find correct replacement mower blade online)

Spounds like pretty klunky system, granted, but all it should take for a
mower blade is length and hole size and whether normal cut, mulching, or
high lift for bagging. Any local service shop should suffice.