SlikStik supposedly has an anti spin mechanism for their new lighted ball top sticks but unfortunately they aren't available yet. 
Co-incidence? I think Christian said the anti-spin was the part they were still working out.
Posted by: conseit68 Posted on: June 24, 2005, 12:23:36 PM
I tore apart the CP of my Xmen 6 Player last night and noticed that the joys there used a rubber grommet also to prevent "twisting". hmmmmmmmm
The sticks inside your 6p X-Men should be regular Wico grommet sticks. The grommets only prevent twisting when they're rusted to the handle. That's not uncommon, but it's also not desirable because you can't dis-assemble the stick if the grommet is stuck on the shaft.
The "nub" method should work well for grommet sticks (Wico, Happ 49). You'd only have to modify the grommet.
Spring sticks (Super, Competition, P360, Reunion) don't have anything at the pivot point to work with. I don't see any way to prevent rotation without modification of the base itself, unless you wanted to produce some other pieces that would bolt on to the base, and those would add cost.