Ebike servo tester throttle

Potentiometer throttle to use with servo tester.
I designed this throttle for my custom Ebike, I'm using helicopter ESC (speed controller) and I needed some easy way to control it. It will work with any Car, boat, plane ESC.
Easy way to control brushless motor is to connect its 3 signal wires to servo tester.

Just remove potentiometer from servo tester and attach new one (20kpot) with extension cable.

Parts:

20kohm potentiometer
GT2 180 belt
2x M3x35mm screw
4x mini M3 bearings
1x 688ZZ bearing
2x spring
Cheap servo tester :
https://www.ebay.co.uk/itm/Multi-RC-Digital-ESC-Servo-Tester-3CH-ECS-Consistency-Speed-Controler-Power-GW/292314083669?epid=27008389654&hash=item440f46f155:g:xXUAAOSwtTVZisEw

You need to glue potentiometer to potentiometer pulley, I used gorilla glue.
When assembling: first mount belt on the pulleys, after that install bearings.

Make sure you leave little bit of slack on potentiometer, when you release springs they may damage potentiometer