Mash network sped up when using an expression to control the Offset Along Curve

[Anonymous]

Hi this is my first post so please do tell me if I'm doing something wrong. I am also new to expressions.

So I am using an expression to rotate a chain on a mash network using a gears Z rotation as the input.

It works but the chain is ever so slightly faster than the gears rotation, I was able to counter this by setting the curve nodes animation speed to -0.033 but then I lose the ability to keyframe the gears rotation and make it go in reverse.

Would anyone happen to know a solution to counter the the chain moving faster than the gear?

Expression used: "MASH2_Curve.offsetAlongCurve = MainGear_16T.rotateZ/360;"