Quoted from allsportdvd:
I’m about to restore my machine. Is it best to assemble the heads outside the machine? I’m planning on 100% new parts to start with
100% mess with them outside of the machine if you need to fix anything more complex than tightening a screw or similar. Reassembling the eye links, coils and plastic linkage is a hassle even when working on a table, I can't imagine doing it while in the machine.
I would recommend going through both heads thoroughly once, cleaning, changing worn/broken plastic parts and so on to minimize the risk of having to do it sloppily several times later on.
Red is pretty ok to remove from the pf but Ted is a pita, you need to remove lots of stuff from both sides to get him loose.
Tip #1: When I renovated my heads I replaced all springs with new ones (having the correct part numbers) but the new springs were stiffer than the original ones and the eyes refused to work properly until I put back the old springs again. Maybe they could have worked if I changed the head coils to new (stronger?) ones too.
Tip #2: When you have reassembled the heads, connect them to the game connectors and test the functionality BEFORE you put everything else (ramps, diverter, helmets, faceplates, subway ...) back into the game.