OK, now sexy fingers here is in trouble.

Today is one of those days which I'm not going to touch anything more.  I got the playfield to lock into the two pins as Ang suggested and it was fine, until I'm trying to get it back off.  For some reason the playfield is stuck.  It will pivot down, but refuses to slide back into its place?

Both sides are locked in the same way.  From what I can work out, when the PF is lowered, the arms hit the upper pins and then it should slide back?