Hi i have a few different ways of useing this and it depends on the type of lathe bed you have, mine is the flat two bar type has about 1 1/2" gap, i have a piece of mdf that fits this and another under it about 3". I make the half template of what i want and leave an extra 1" more this gets screwd to the piece that comes up from the bed, making sure you have a centre line on that 1 1/2".
Then i have a mdf bed with perf metal to help the tool slide or you could use formica. Just make sure that you have the tool so it is just a bit above centre or you will not get the tool to cut, and if you are a bit below then you could have some problems and have it bit in and ripe your work out, and or get hurt so make sure you set it all up right and nothing is lose, the size of the duplicator depends on the type of lathe and the hight of your tailstock centre, when i get time next week i will put it all together with pics and how to, for anyone that wants it, most of you i think will crack it. Templates are half of the item you want to make (make them good take your time) and make sure that you set them on the centre line of your lathe. You could have a look at the shopsmith site, theres uses a follower above the cutter, there are a few copycats around the net just do a search on google and you should find more info if you need it before i can get this done, ill do it in a pdf form. I hope you can follow that.
And yes it works okay not the best finish but it gets you there and then finish of with some grit, or a bit of rework if ness, it does save some time, just make sure you concertrate on what you are doing its not like useing a chisel and if you don't set it up right be sure you will get a catch, and it can be more scary to, and yes i have done it, it only takes once for me to learn, my thumb
was sore for a couple of days. cheers LB