The shaft and the bushes don't seem out of round to me. Perhaps they just went dry and need a lot of oil putting back in them like @Brad93 says.
I just tried to install that motherloving T-Link belt. Just NOPE! Very, very frustrating.
It cannot be just threaded through, it wants to be curling over so the outside face is inside etc. etc. and it is too stiff to get to pull/push through the tiny gap up there in the headstock.
The fact that my machine is backed up against a wall is not helping either.
I shall go search YouTube to see how it is meant to be done.
I just tried to install that motherloving T-Link belt. Just NOPE! Very, very frustrating.

It cannot be just threaded through, it wants to be curling over so the outside face is inside etc. etc. and it is too stiff to get to pull/push through the tiny gap up there in the headstock.
The fact that my machine is backed up against a wall is not helping either.

I shall go search YouTube to see how it is meant to be done.