Hello, Docmo here,
Unless you are already an accomplished archer, I strongly advise that you use the specs for the "twisted nylon rope" bowstring, found in the book. It is worthy of battle, and very safe. They last a long time and give ample warning of wear, before failure. And, failures are never violent. After you have the weapon tuned and tested, or you want to shoot competition, you can put a "real" bowstring on it. This will increase the power and the consistency of your shots. However it will require more maintenance than nylon, and inflict more damage to softer ammo.
How to make a 4pin jig for winding your own strings.
You will need
5 or 6 very large nails or 1/2 dowels, either way they should be 6 inches long.
A surface, It could be a workbench, old picnic table, or even some heavy plywood.
Measure out the pin locations as shown in this picture. Hammer in the nails straight, or drill and press in the dowels. If you are using nails, cut the head off of no4. And sand it smooth and round.
Now locate a convenient spot to mount two more pins, 56 inches apart. Maybe use pin no4, and one located 56 inches away, or a different location on the bench altogether. Be sure to remove the head of one of the two nails.
The no5 pin can be located anywhere convenient as long as it is 56 from the no4 pin.
Winding your string.
It is imperative the center serving be round when done. A squareish or twisted appearing center may cause firing problems
You will need,
A 1lb spool of B-50 Dacron bow string material.
I prefer, and recommend a "Cavalier" serving spool. They are made of steel instead of plastic, and are very sturdy.
1 spool of serving material. After this spool goes dry, refill it with B-50.
A stick of string wax. I recommend the softer stuff.
This stuff can be purchased at your better archery shops, but some of the best prices can be found at war events.
Tie the B-50 to pin no.1
Wrap around the outside of the 4 pins a total of 40 times. Hold the string taught it. It is not nessary to pull it tight enough to bend the pins, just snug enough to keep it in place. Also try to keep the windings neat and straight so they dont overlap, when you have finished with the 40 loops, tie the B-50 to the no1 pin and cut it off the spool.
Apply some archers bowstring wax and rub it in. Using your hands, squish the skeins together and roll them in your palms,
Cut off a piece of serving material about 18 long, and save for later.
Set up the serving spool. Tie the end of the serving material to 1/2 of the 40 strands, near in pin no1. You need to keep the serving tight, so keep the wing nut snug enough, but loose enough to allow the spool to spin. You may have to adjust it a few times during use.
Serve the loop all the way to pin no. 2.
Pull some extra string from the spool while holding the serving in place with your thumb, enough to go around your fist and the skein one more time, pass the serving tool through this loop and pull on the tool to tighten the knot.
Readjust the serving tool and serve to pin no1.
Repeat the knot and serve to within 1 of pin no2. You should now have three layers of serving between pin no1 and pin no2
Take the 18 piece of serving material, and fold it in half, then lay it along the serving that you just finished. Have the end with the loop hanging off the serving about 6 inches. Have the looped end above pin no1. See the picture.
Continue to serve the skein with the tool 6 more revolutions, making sure to cover the 18 string.
Pass the serving tool though the loop that is hanging out. , One time only.
Hold the serving tight while you pull out several inches of string from the tool. Then grab the loose ends of the 18 string and pull it out from under the last 6 revolutions of serving. It may be necessary to use pliers. But dont fight your self by pulling on the serving tool. Just let it hang loose.
This will cause the end of the serving line to be pulled under the windings and held tight.
Carefully cut the string off the spool and trim the hair off the skein.
Repeat these steps between pin3 and pin4.
When it is done remove the whole assembly from the four pins, by cutting the tied ends off of the no1 pin and start pulling it off the no4 pin.
Fit the skein on the 2 pin jig, centering the part you just served on the pins. This will make the loops.
It is important that it be held snug and taught. If it is too loose, pull off one end and twist it until it is short enough to be tight.
Apply some archers bowstring wax and rub it in. Using your hands, squish the skeins together and roll them in your palms.
Do a short serving, about 1-inch with 1 layer at each end to close the loops.
Cut another piece of 18 serving material and save for later. Find the center of the skein, and measure 2-1/2 inches to the left. Tie on to half the skein windings and serve as you did the before. Continue until the tool has served 5 inches. Make a knot and pull it tight as before, and serve back over the length again, make a knot and serve over the 5 in length again for a total of three layers. Use the 18 string trick to finish, and you are done.
If your first one does not look too pretty, dont get discouraged, it will still work for a period of time, and your next one will be better
Wax the whole thing now, and after each battle or 100 shots.
Store the strings in a ziplock, to keep them clean and free of abrasives.