How to make an endless loop bow string jig for around $40 to $60.
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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.
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With the method we use you’ll need a vice, towel, and a 3/4″ wrench. Some muzzle devices will use shims instead of a crush washer. Make sure you’re getting the correct device for your specific threads. As always, do some good research before you get too crazy. Torque specs vary by device and manufacturer, however with most, if not all, the spec ranges from 15-30 ftlbs for 1/2×28 threads.
This is also a great video:
https://www.youtube.com/watch?v=XjWXwDSt-KY