Quick update, just got home and found my package from
@stealthvape has arrived. The 510 deployment tool has now allowed me to remove the old 510 from the mod, it was threaded in there fairly tight but it came out quite easily one I'd managed to get a few turns on there
The retaining nut split in the process but here you can see where the -ve bar runs from the battery connection past the back of the nut and into the back of the board. I still need to desolder that at some point. (Looks grubby inside when it's blown up like this!)
The damage to the top of the mod is mainly superficial and hasn't gone all the way through. On closer inspection now the 510 is out the catch cup is actually part of the mod, this will largely be covered by a replacement 22mm 510 plate but I'm going to have to find some way of filling up the area where the original 510 sat otherwise I'm going to have a lake sat under the new 510... suggestions welcome.
The other problem is that the
@stealthvape source 510 is much wider than the original. This will mean drilling out the original hole to accommodate it, but given how tight it is below I don't then think the retaining nut will fit because of the way the board area protrudes into the 510 area.
Option one is to set the 510 back slightly to leave room, option 2 is to source a 510 with similar dimensions to the original (approx 10mm).
One other thing to note is that there's no direct link from the 510 area to the board so all the juice that was in there on arrival was from over squonking on the previous owners part, and the face plate isn't very well sealed (it appears to only be glued in several spots around the frame) allowing liquid ingress.