I have an old MTD self- propelled lawnmower that has a ratchet assembly on
each rear wheel which depends on a threaded nylon leaf- spring to operate.

The previous springs lasted several years each, but just this summer I
bought a replacement set after the previous ones failed (broke) and the
replacements have just lasted seven weeks, and seem to want to curl or jump
off their tracks.

Should I just try another pair, or has anyone found a good workaround? I
can just lift the rear wheels off the ground to back the mower up if
necessary, but that doesn't allow mowing in reverse and is a little hard on
the back.

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