Mk II Dobsonian 16" f5 truss tube
Truss tube
The 25mm tubes are all the same length. There are four left-handed and four fight-handed ones.
The top fitting is straight out of K&B and seems to be used on 12.5" Obsessions:
The bottom fitting is also from K&B, with the clamp and stop screw fixed to the channel,
and the whole thing bolted to the mirror box with just one M6 bolt:
The whole tube is extremely rigid when assembled. Just as rigid as Mk I.
New Dobsonian home