I clobbered up a 10 inch long peice of 6x6 wood to which I screwed a peice of 1/2 inch plywood to the bottom, the plywood is about 2 inches larger than the 6x6. I then screwed a 6x6 peice of ply to the top of the 6x6. The former is for stability and the latter prevents the 6x6 from splitting.
This takes up the space of multiply blocks of wood or the device complained about.
It has served us well for many years of hard use.
I did nail a peice of rope to it to make it easy to carry.
HIGHLY RECOMMENDED
CCC