Rather than hockey pucks, try something like these:
http://www.alpinehomeair.com/viewproduct.cfm?productID=453058383
http://shop3.mailordercentral.com/supersoundproofing/products.asp?dept=25
http://www.pexsupply.com/DiversiTech-MP-2E-EVA-Anti-Vibration-Pad-2-x-2-x-7-8
(I wish we had a Canadian...