Hey McC -
You can get the silicone blanket-heater cut-to-order shapes - see HERE - would be interesting to find out if Hugo uses this stuff - it is pretty well-known to us 'old timers' cause it was famously used on what was the 'King of Galvos' for many years, the G-120...
Interestingly, PL-member LesioQ has these FS (just found it by chance, looking for pix of G-120s with heater-blankie to post)...
http://cgi.ebay.pl/XY-laser-Blanking...1%7C240%3A1318
...pretty nice bit of kit for someone looking for 'mechanical' blanking...
Anyhoo, the 'chromalox-style' blankets work really good...
peace..
j