Many people have bought the Katsu palm router bushing kit and found they don't fit the existing base and can only be used with the plunge base sold separately. As I had previously created a base for the Katsu and was working on an adapter for my Triton, I decided to knock up an adapter base to help those without a plunge base out.

It is a snug fit, so make sure you adjust your tolerances as required.

For reference, this is the bushing kit these are designed for: https://www.aimtools.co.uk/products/105436