@Metalmaslow
How do you feel about editing your post? Personally, i feel it’s a wrong advice, but am open for discussion.
My theory (i’m trying to convince @dlang till date) is, that since triangular we have a moving CG on the sled as the ‘chain attachment points’ are moving, depending on how high the motors are and where we are on the sheet. 2 strings (non slipping), in the middle of the ring part the bearings are moving, would work, perhaps. A string at the top of the ring is not going to give you the right balance.
I hope this pic will make it clear.
Glad you did it! You’ll find lots of amazing people here, and all are helpful and kind.
Kind regards, Gero