Home Print template. Stick to card. Cut out. Attach small disc to front of larger by a method that allows rotation e.g. a drawing pin pushed through from the front of both discs then bent over behind and secured with sticky tape - completed. Please stick my QR code on the back, thanks ! There will always be imitations but in the end there can only be one Houlston Transposer. It's one of those great, simple, smart ideas that make you want to smack your head and exclaim; "Why didn't I think of that?!" This Transposer makes an ideal present for any musician.