Viv,
I think I have to majority of the Helium system but I haven't messed with the cryopump at all.
I've been just itching to dismantle the T-Mole-Pump to get at the rotors, but I think I'll just keep it complete for the moment.
For those that have never seen the rotors/stators on one of these, check these out:
http://www.ansys.com/industry/defense/s ... l_2001.htm
http://www.teco.com.tw/sbu/en_version/pro02.htm
s.
Vacuum forming sheet metal
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