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The kit is used as an upgrade for all the TruSpeed controllers, but will fit most other contollers too.
The feel of a controller is an improtant feature to a racer, so if you can set the tension on the trigger this can be a great help.

Installation:

1. Remove the original spring from the trigger.
2. Replace the original spring mounting post with the new bracket, or find a suitable place to mount it on the controller internal frame.
3. Fit the new spring to the trigger and feed the tension adjustment screw through the braket and screw it into the spring at the other end.
4. Set it to about mid tension and check that the screw moves freely within the spring when the trigger is squeezed. You should rotate the bracket to keep it aligned with the spring movement and if necessary bend it outwards to keep the adjustment screw moving as close to the centre of the spring as possible.
5. Drill a 4-5mm hole in the throttle casing in line with the adjustment screw to allow for easy adjsutment once it has been  re-assembled.