These are the details and loads for the critical lower
tube. It has been increased in diameter to 7/8 inch.
All other tubes are 3/4 diameter 0.049 4130 chrome
molly. All four rubber mounts must be connected
together with tubes for this scheme to work.

That stabilizes the mounts and divides the shear and torque
loads equally in all four mounts. Worst case is about
500 pounds vertical shear load in a 6 G hard landing or
pull up.
 
Paul Lamar
 
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