With ~10mm OD shaft tube the cross dowel should fit nicely, could even run a couple of them through the shaft to really clamp things in. For 50 of each collected it's £6.34. If people think it would work and are interested in splitting the order then let me know.
Might make life easy to cut two 50cm bits for me then. I can pick them up, drop one at mine and cart the other one down to polo for Salman.
I've also been looking at fixtures for mounting the head...
http://www.screwfix.com/p/cross-dowels-m6-x-16mm-pack-of-50/67762
http://www.screwfix.com/p/joint-connector-bolts-m6-x-35-bzp-pack-of-50/87106
With ~10mm OD shaft tube the cross dowel should fit nicely, could even run a couple of them through the shaft to really clamp things in. For 50 of each collected it's £6.34. If people think it would work and are interested in splitting the order then let me know.