Marc has it right; wish I'd thought of adding the s to upper and lower. For uniformity, my CDO* required the letters to appear on the same pairs of tees. The glue was the most expensive part, although probably not required. At first I tried weaving them together with 550 cord, then using cable ties, but in both instances it was a little floppy. It'd be cool to try a steampunk version, but I need to learn how to solder copper and it would jack the price up.
*CDO =OCD in proper alphabetical order.
--Dave--