The attached photos are of parts in a lathe I have, probably a copy of a G. Boley lathe. The lathe can be used as both turns and as a lathe with split chucks. In order, they are: Mystery chuck: I have no idea of its use. The thread is about 6.5mm and the head is about 15mm diameter with a hole about 2.5 mm and a fixing screw for the rod. Rose cutters: According to de Carle, “The Watchmakers’ Lathe”, they are rose cutters for making recesses and where a “pipe or pivot shaped piece is required.” The brass piece is the only holder that they fit in and it is about 16mm in diameter. There are 8 “rose cutters” and all are about 9mm diameter with different sizes of holes, so they cannot make different sizes of recesses. I think de Carle is wrong, but … Rose cutter holder: This attaches to a tailstock. I first thought it might be a drilling tailstock, but there is no way to hold a drill. Indeed, the only attachments that fit id are the rose cutters! There is also a plain, flat brass insert about the same diameter and I have no idea what it could be used for. Tiny points: Length about 40 mm, diameter about 2mm. I have 5 out of 6 and all have different points. Obviously hand held, because of the brass, knurled end, but they do not fit into any other of the lathe’s parts! Surely they are not meant to be held “free-hand” but … I can post other photos of the lathe if you want them, but everything else is standard and intelligible. So what are these pieces for?