Mouse Vader
Sr Member
Could someone give me dims for the box (& that groove depth). Length doesn't need to be precise but width fairly close. I'd like to have a crack at a flat bottom fit to see how hard it'd be to produce what I'm seeing - if that makes sense. TT's rylo looks to have more clearance than it might have & is too 'tidy' for my liking. I'm thinking the end of the flat (if it is a flat) is going right on the edge of that groove with a paper thin burr that maybe partially missing (missing on far side in this pic),

I don't have a suitable 1.5" cutter & I doubt one would fit my milling collet or I'd try the concave base too. I also have no axe to grind on which method it is and there's good reasoning going on all round. For me it's just that we don't have good enough images of the real thing to push it one way or the other.
Sorry BRR but I'm with TT on comparing photo's this way. Each would have to be taken at the same distance with the same lens & at the same angle for such small differences to be a viable comparison.

I don't have a suitable 1.5" cutter & I doubt one would fit my milling collet or I'd try the concave base too. I also have no axe to grind on which method it is and there's good reasoning going on all round. For me it's just that we don't have good enough images of the real thing to push it one way or the other.
Sorry BRR but I'm with TT on comparing photo's this way. Each would have to be taken at the same distance with the same lens & at the same angle for such small differences to be a viable comparison.