Yes I did have some issues with the retract units at Florida Jets, they worked good here at home on our paved field, but then lesson learned at Florida Jets, newly machined fits don't work well when the sand kicks up and gets in the workings. I have broken the edge on the slot as the retract pin travels over the sharp edge coming off the lock position, up and down. I expect this should solve my problem, it has worked before for me when flying off grass fields. This photo shows the sharp edge, and just how little is removed to free up the travel, do both edges coming off up lock and down lock positions.

Jim