Quote Originally Posted by Philippe Grunchec View Post
Ian, the head is not creeping, the problem I have is different: it is very difficult to insert the negative carrier, I have to lift the front part of the head to get enough space for the carrier. Forgive my rusty english...
Phiippe, I had this problem too on my 504 Mk4 - but moved the spring on the Head to the lower hub (to put more tension in the spring)

Now, when I move the lever to release the Neg Carrier, the head lifts enough to slide the Carrier out without difficulty.

BTW, I never found any reference to this in the User Manual

Hope this helps