It’s not a lot of steps. I think it took me maybe 30-45 min or so. I can do it tomorrow.
I think I spent more time adjusting the teeth and making the tool than anything else.
If I get all the way through it and don’t make any stupid mistakes like leaving sketches completely uneditable, I’ll put the whole the whole Fusion file up.
So, taking your original Makita design, I opened the hole up to to 68mm, but did it offset 1.5mm so it didn’t alter the thickness of the back side of the ring.
The Cam Ring on the inside had 0.1mm of clearance, and the sketch looks like this:
So the center of that circle was offset 0.5mm back(1.0mm from the original center), and then I just remove part of the back where the plastic was going to be thin.
That’s all the easy part. The trickier part was setting up the notches on top and the front notch that aligned with the longer top notch that gave you the original alignment of the router with 0 adjustment.
One thing that certainly could have been better on mine with the Makita, was that since I didn’t have the original CAD, I couldn’t easily adjust to hose attachment, so I didn’t bother with it.
If you are going to make an official one, you’ll probably need to handle that better.
Another I did on mine was open up that back wiring notch a little wider. I was having trouble having mine get pinched, so I needed a little more clearance back there.
If you want to take a crack at it feel free. Just let me know if you have any issues or want some more information. I can still get to some of the sketches, a few of them are just not editable anymore.