Z-Height Probem on Relief Carve

We do not support aftermarket, unsupported items (like your spindle), which is stated many places.
Tech support is limited until your able to have your machine in a factory configuration, with the Makita router.
After you return the machine to supported configuration, and if a part is defective determined by support, it will, of course, be covered under warranty!

Spindle shim sold here (physical and digital file available):

Citations:

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