This helps ensure no harmful moisture resides in my Mirror Box. I can't say I am completely happy about the truss clamping system I used on the 13. On the right of the truss, there is a dab of silcone to aid springing the block apart to remove or insert truss. The block does not need to come apart completely to insert the truss. A couple views of the upper clamp block set-up.
Dowels are for locating the loose half, and prevent turning of that half.
Again, no need to take apart like this for insertion or removal of trusses. The angle of the drilled holes can be determined by a full scale layout of your telescope. Even if you are a degree or so off, the clamps will still work beautifully. Use a tilting Drill Press, or make an angled jig for drilling the holes if your Drill Press does not tilt. That's a little block of rubber, above and to the left of my thumb.