my husband installed a block on the sled where i wanted it to be and now it almost touches the paper. when i don't use it, i swing it out of the way. if you choose the right spot, it doesn't hit the roller.
i tell everybody who owns a tin lizzie to join the tin lizzie yahoo! group. you can check up on pictures of all the retrofits that people have been clever enough to think up.
btw, this is true of all the machines. almost everyone i know has retrofitted her machine to suit personal needs. check out the sharon schamber website and see what she does with a fishing pole guide.
edit to add: if you're still unsure, call tech help. i personally find them excellent helpers. they walk you right through step-by-step.