
It can happen that spar leading tubes are too tight and it is difficult to insert carbon spars into them.
One option is to use ordinary bicycle steel spoke (2mm thick). Cut the head and the thread off,
make some kind of sharp edge and mount it into a drill. This way you can drill through all spar
leading holes to remove all printing imperfections. Another option is to use metal cable which you
can straighten and use in the drill.