Rotor arm problem

[den912]

My Rotor arm on my distributor is no sitting tight it’s got s bit of movement and when trying to start the car it’s hitting the distributor cap and makeing it come loose,the engine is a 914-6 engine ,I bought a new arm but it to seems to be loose on the shaft and working the cap loose ,any ideas what I can do
Brian

[john walker's workshop]

Should be just a vw bug rotor, 70s style.

[rwest]

Sure it’s the rotor and not the shaft? With the rotor removed, see if you can move the shaft back and forth (side to side) with your fingers.