On Thursday, July 7, 2016 at 9:21:28 PM UTC-4, Karl Striedieck wrote:
My first Duo trailer showed signs of those two cross bolts working, so I drilled a 1/2" hole vertically in that area and installed a grade 8 bolt to hold everything tight. No working thereafter.

I'll so same with replacement Duo/trailer.

Piet Barber has that rig now and he might share pics?

I took some pictures of this on Saturday, hope they help the discussion a bit:

https://sites.google.com/a/pietbarbe...a-modification