If you have cut the edges of the pricking parallel to the pricking, perhaps you could wrap a tape or ribbon around the roller at the edge of the pricking as to act as tramlines; as you work you just need to keep the pricking sitting squarely between them and do tiny tweaks as necessary.
Obviously it is a good idea to make sure that you have started with your pricking absolutely parallel to the edge of the roller. After that, I find it helps to put a pin or two in as low down on the front of roller as I can get, to make sure it is feeding straight, and if it's moving sideways a little this is where you can tweak it; pin in several places across the pricking to move it back to straight. A tiny amount of ease just sort of works in, but if it is more than a a millimetre, you maybe need to straighten it back up over two or three sections. I never pad the roller to fit the pricking, so nearly always have a loop of pricking hanging below the roller - I don't see that your long straight feed should cause any more difficulty. Jacquie in Lincolnshire - To unsubscribe send email to majord...@arachne.com containing the line: unsubscribe lace y...@address.here. For help, write to arachne.modera...@gmail.com