A few years ago I built a crossbow after stalking this forum and much research. I fired it a few times, but then moved several times and so was never able to fine-tune it. I came across it in my garage recently and would like to finish it properly.
- The first issue was the string's penchant to jump over the bolt. This I believe is caused by the string riding up the roller nut, most likely due to it being constructed of mild steel. I believe I tried to counteract this by giving the roller nut curved fingers and relieving weight by drilling holes in the nut. My thoughts at the time were that this would counter the rising string so it would release later. The prod is Alchems 1732, I think it was a #225 lb draw. I never thought a Delrin nut would be strong enough for this application, am I wrong in that thought?
- The second issue I remember was when the bolts I made did fire, the back end made a large circle all the way to the target (10-15yd) without stabilizing. Now the "fletching" was ductape I believe, with a very minor twist. Taking that into consideration, am I right in thinking that the bolts were too light? Or am I way off base?
Any advice is greatly appreciated!