I have two Gaahleri airbrushes including the GHAC-98D with the original style chucking guide. It was a problem immediately because the two parts of that chucking guide are not mechanically fastened together so the lever that the trigger pushes against would very easily fall off its mounting post, especially while cleaning.
But it seems like chucking guides are pretty common parts, I swapped the Gaahleri one with one out of a different brand of airbrush, and bought an Iwata chucking guide off a major online retailer for under $10 shipped once I knew that worked (and that was long before Gaahleri apparently redesigned the part). Obviously that's not free but if Gaahleri doesn't replace the part out of customer goodwill at least it's not an exotic fix.