Soundlab voice coil setup

[AndrewT]

Hi,
just bought a damaged Soundlab P 18110A.
The magnet has come loose and is jamming the voice coil. I think it has taken a knock in transit.

I have found 4 allen keyed bolts around the spider but they do not hold the magnet tight.
How do I get in to adjust the magnet to centralise it around the coil?

Or do I remove the cone and coil and do all the adjusting from the front?

What is behind the manufacturer's label on the back of the magnet?

[Byrd]

I have done this with a nasty old driver before - however the frame was glued to the magnet instead of bolted. I removed the dustcap and used a set of shivs between voice coil and magnet core to centre it after applying epoxy to relevent areas.