Yes, but not about the duality of the heatsink. The graphics sink is part of the conductive bar and in the photo has the grey pad left stuck to it. I imagine the folk on that forum were talking about jamming the coin either in, or in stead of the grey pad.
Thanks for the briefing on the re-balling. I'd love to see it done in real life. Not that one can see the actual flowing.
Really, I think this machine will have to live or die. I don't think I'll launch into that complexity now I don't have a proper hobbyshop.
The update - if that's what they could call it - has finished. I'll pop over to that thread with some 'interesting' comments.