Originally Posted by
mac112
I have a 4mm RH tap ( turn to the right to cut the threads, left to back out of the hole) that is 4mmx0.7. will this work when building the arms?
That's the one. The issue was that the upper arm hole was too small, along with the stronger plastic it's made of (graphite mixed in, maybe?) means it was very hard to turn the turnbuckle.