Left: Weldment mount (bad) Right: Cast mount (good)
Weldment would not lay flat against the swingarm
My next bright idea was to just use a triangle stand in the garage. I fashioned an adapter that fits into the mounting pivot for the chain tensioner. This had the added benefit that the stand was operable from the “normal” motorcycle side (as opposed to the trials side). It worked for a while but eventually distorted the mounting pivot sufficiently that it no longer tensioned the chain.
So now I am stand-less except for the “B” 250 that came with a robust mounting modification (at least one bolt all the way through the swingarm) courtesy of the prior owner. I will probably keep it that way but will not expand the concept to my other bikes.
Triangle stand adapted to fit chain tensioner mounting pivot