(Remix) Tracer 9 GT Chain Slack Jig

I really loved the original idea, so simple and effective. But I noticed the OG measures from the chainguard down to the top of the chain. Yamaha manual instructs you to measure 45-50mm to the middle of the chain while pushing down on it.
I adapted the 46mm design to measure the correct distance.
The 3D printed spring tensions the chain down, instead of having to push the chain down with a finger. Adjust the chain tension until the edge of the side pieces lines up with the center of the chain.

Printing instructions: 
Prints with tree supports on buildplate only.
Use PETG as PLA is too stiff and will likely crack (at the spring)

I've made a spring into the model to be able to measure to the center of the chain. Adjust the chain slack until the side pieces line up with the middle of the chain.