[cp4000]

I have a 1988 3300 Open so probably very close. There is a like a wire "C" clip in the wiper arm under a very thin washer which keeps it in place. I believe that "C" clip should release when force is applied to take it off. Those are on there pretty good so I normally gently pry it off with a flat blade screwdriver but that damages the washer which holds the clip. I was able to find a few new ones on Ebay and the first time I took it back off to adjust the position, the washer broke off. Mine are currently just pressed back on with technically nothing to secure it. I don't like leaving it that way but they do attach themselves pretty good so I am not too concerned at the moment. Would love to hear any other experiences out there...