I had the somewhat dubious pleasure of working for Falcon for around 18 months during the early 1980s (I forget exactly when, it was a LONG time ago). I remember the problems we had trying to get the lasses who applied the decals (called 'transfers' back then) in the correct places on the seat and down tubes of bare frames rather than slap in the middle which looked 'right' to them. There was a simple solution - a couple of cardboard tubes split length ways used as positioning stops for the decal backing papers. Worked ok as long as they didn't get them mixed up.