I never have had an issue with the front pin holder coming off any of my kits, my rb6, rz6, rt6 or my sc6........ If you have issues the easiest way I think would be to put some silicone on the end of the pin, then put the holder on, as it dries it would make it a tighter fit that would still easily come off with a gentle pull.

I know that the part numbers are different but the arms look the same, what is the difference between the rt6 arms and the sc6 arms? I am in Vietnam and seem to have issues getting RT6 arms, every time I need to order them Amain is either out of stock or only had one or two in stock, but they always seem to have sc6 arms, would they work? I do not have any spare sc6 arms to compare, so for me to do so I would have to take my sc6 apart (arms for both have been ordered)