Hi,
I use to mod Zip Zaps but those were too samll..so now i am going to get a Xmod

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I see that you need a heatsink for the motars...so what you should do to make it work well is get some THermal Paste. Basically, the way you have teh heatink on the motars now it is just metal to metal contect. With thermalpaste it fills in the cracks to get better conteact...makeing the heat transfer ALOT better..this is used in computer and has shown up to 10 C diffrence...You can get some from any COmputer store..f you want the really good stuff get: Artic Silver This stuff is "the" best for it..or get some cheap **** for ratshack..
Hope some1 trys this..
l8ter days