I have not used mine much and it looks like you have yours so have you found a need to get new cutters or can you sharpen these and if so how??? The cutters are not cheap. What was the hardest wood you used it on??
I like the aluminum dots in the first one.
They are easy to sharpen: you let it run on a spindle and you use a diamond file: Sorby made two
YT vids, look at the first one at 2'. The main trouble I had was the tool axis worn out twice, so I put some ball bearings, and it works nicely now.
The tool works well only on very hard wood. Boxwood or African blackwood are perfect.
The dots are black mother-of pearl in fact, not aluminium. I love MOP!