Matt,
Try it, you'll like it. Also works on a 36 blower great but try just 1 5/16 hole and check the hg with your wand on the carpet. 45 and 47 usually require the 3-5 holes. Its simple and YES IT DOES WORK. 100-150 ft of hose, piece of carpet next to van, put wand on carpet, one eye of the hg guage. If it reads 16 or more hg and you want to take it to 15 drill a small hole(1/16 or 1/8") until you get the reading you want. For me 15hg works great. You'll actually get more VACUUM and GRIP on the carpet with FREE-FLOW. I tried it with a 36 blower machine(mine), a 45 blower machine(Dave Stover's) and a 47 blower machine(mine). Tomorrow I will try it on a EZ1633 33 blower machine and the lift will be set at 16 hg. I'll let you know about the results.
Mister Sir