Concept2 Forum

The flywheel is definitely mounted tightly and squarely on the axle housing. I've taken it off three times and it is an absolute tight fit with no wiggle room. The clearance is less than 1/1000", it is an excellent fit. It sounds like it is the balance, and that means a new flywheel (with no absolut...

Is too losely attached to the axel, allowing it to have too much movement? This would be rectified when speed goes up. No, it has no wiggle on the axle when stationary. It does not slide left or right on the axle, the nuts on both sides were properly tightened, and I've reassembled twice to make su...

Here's the motion of the flywheel:
https://youtube.com/shorts/Yxry3PX9iKQ

As the video should show, it is the same motion as if a spoke on a bicycle is loose.

(Thanks for the welcome to the forum: long-time forum reader, first time forum poster)

My team just got a Model C as a donation. It is near mint condition - no damage anywhere, just dust. After replacing the shock cord, putting a new handle on it, cleaning and applying oil, and replacing the PM with a spare PM3, I thought it would be just like a new one. However ... The erg vibrates a...