Your engine "Requires Precision Modification" to your Spinner Backplate.
We will modify Tru-Turn Backplates for any R/C engine available. Please Note that it is "CRITICAL" that the bore in your Backplate be concentric and precision size. The integrity of your Tru-Turn Spinner's performance relies on the bore in your Backplate.
For $ 7.50, we ream your Spinner backplate to the required diameter, based on your motor Brand and Size. We even drill for engine drive pins as well!