I've actually thought about adding an extra arm to my TNT by drilling the requisite hole in the left rear corner - ie a direct mount to the plinth.
It looks like the TNT would have the 'real estate' to accommodate an extra arm, but i'm not sure if there would be any negative ramifications (ie possible damaging vibration etc) by doing this.
It looks like the TNT would have the 'real estate' to accommodate an extra arm, but i'm not sure if there would be any negative ramifications (ie possible damaging vibration etc) by doing this.