I have one of Roy's machines and they are beautifully made. Setting them up is not so straightforward ,you have to put a big bend in the needlebar and then you'll need like five bands doubled over to stabilise the bar I've also used two Orings at 16mm id which looks neater on the machine.The frame on my machine already has two notches machined into the edges which stop the Orings sliding down.With fiddling this is what works albeit tedious,however I have some Needlerunners on order and hopefully they will put an end to this game.