How to make an endless loop bow string jig for around $40 to $60.
https://www.seansoutdooradventures.com
Parts list – see below for a list of things you will need.
1 = 10 foot unistrut
One diamond circular saw blade to cut unistrut
(Cut 2, 1 foot sections off of unistrut for string jig arms, and cut two 4 inch pieces of unistrut for the angle iron used in string stretching.)
4 – 6 inch long 1/2 inch bolts
4 – 1/4 inch bolts about an inch and a half long with allen wrench head and smooth top section
(Have the 1/2 inch bolts tapped and then screw the 1/4 inch bolts down in the top leaving the smooth part exposed for wrapping string)
8 – 1/2 inch nuts for securing ½ inch bolts to unistrut (one on top and one under unistrut)
4 – 2 1/2 inch long 3/8 inch bolts (2 of these will be used for securing the string jig arms to sliding bolt inside unistrut, and 2 for securing each string stretching jig.)
4 – 3/8 inch nut with spring backing that fits into the unistrut
2 pieces of angle iron—you will use these with garment hook for string stretching.
2 garment hook bolts with nuts (these will go through the angle iron for string stretching)
4 – 1 inch long 3/8 inch bolts and nuts for attaching angle iron to unistrut
2 – 2 inch long 3/8 inch bolts, nuts, and washers for bolting unistrut to table
2 – small bolts about an inch long with 4 nuts and 2 washers – for the side of one jig arm for attaching loose string ends to (Diameter of bolt not important, whatever you have will work.)
If you don’t have them already, 1/2 inch diameter and 3/8 inch diameter drill bits for drilling holes, and also a drill bit that will fit the size of bolt you use for attaching loose string ends.