$10 set from Harbor Freight #3577 (note: 2022 price is $12)
One trick that some people know is that if you have a drill bit set you also have a fairly accurate set of setup bars. OK, so they're round but you can use the shank end of a 1/8" drill bit to space an item exactly 1/8" away from a fence or set a 1/8" gap between two parallel boards you are fastening down.
The transfer...