So how do you keep the SSQA locking pin from popping out?
I put a 3/8 plate at the base which gives me about 60 thousands clearance between the SSQA and the female. My tapered pin is through the female with about 3/4 inch protruding. I put down pressure that was not enough to raise the tires and both of the SSQA adapters popped out from the bottom. The handle didn't release so I presume the tapered pin overcame the spring pressure. Not good, I'm glad it was a test and not a working action.
Will adding washers to completely close the spring be the answer?
Maybe the full tapered pin must protrude to the point past the round rod?