I don't have a thickness sander, I plane to thickness all my tops, backs, sides, overlays, rosettes, etc.
I even plane my truss rod channels!
But two jobs always require me to use power tools to get a quality result - rosette channels & binding channels.
I have very nearly bought the LMI rosette cutter (SPCC) quite a few times.
So Michael's innitiative in tackling a quality tool for rosettes was great news to me.
When my dearest suggested that she'd bought herself enough band tickets to class as a xmas present so I should 'Santa' myself something special, I immediately thought of this thread.
The tool arrived promptly and nicely packaged.
Unfortunately I haven't been able to use the rosette tool yet , but I do have a question regarding it's use.
When using the knife blade, do you use the same line on the template to set the rosette's edge and the rosette channel's edge, just spinning the blade around so the waste is on opposite sides.
I know this may seem obvious, but I'm not sure if doing this would create a rossette smaller that the channel.
I guess the other thing that occurred to me is that the knife blade is unlikely to ever be exactly placed in the centre of the square HSS rod.
So when spinning the blade 180 there would always be a need for tiny adjustments in position.
When just playing around with my tool (as I'm prone to do

I should add though, that the sliding dovetail is beautifully made with absolutely no slop in it whatsoever!
Anyway, as I said, these are just musings of mine and it's probably just a case of learning to use it in practice - like all those hand planes & chisels & things that I never used to know one end from the other.

Thanks for the effort on this specialised tool Michael.
I hope my funds go some ways to paying off that insane piece of russian hardware you bought to do the job!