My joiner.
I made 2 and marked the best joiner with A.
I read somewhere that someone uses a clothes pin with a slot. First I glue on the side guides with the other side wrapped in plastic.
Then I cut a slight with a saw and the drill a hole. The belt fits snug in the hole. After welding, pull thru slit.
Works fantastic. I wet the wood before a session as I melt the belt ends with a lighter. No need to start belt ends on fire. No burnt fingers. I look for the tiniest smoke. I rarely have a bad weld. (I made quite a few now!) I found that it is best to make the belt a little undersized and stretch to fit.
I tried breaking the belt and I cannot with my hands. Amazing.