Originally Posted by
KenmoreRulesAll
This machine is equipped with a spring mounted motor that allows the pulley to rest apart from the wheel so that hard spots don't form on the tire. This is what causes the sound you describe.
Aye, I found that spring-mount - startled me for a second because I thought something was loose! It's a very cleverly made machine, I think. You're right, it's not boring at all, the more time I spend with it the more elegant it seems.
Sounds like you got a killer deal on yours!