Odd, all the diabolo wheels I fitted as groundcrew had a segment cut out to enable the pin to fit behind a locking device, in order to prevent inadvertant extraction.
WRT gats, the decision to withdraw slings from the HK was the result of a floppy driver hanging his on the stores boom while he did the walkround. Said gat eventually dropped off, resulting in a phone call to the feds from a local complaining about the new hole in her garage roof.