Be prepared to sand...dremel...sand...dremel...sand...and so on...

The Knurling on the Throttle Tamer tube is to large an OD for the Heaterz and they have a hard inner body to the grip so you can't use compressed air to get em on there.  Had to remove all the knurling and basically take them to just a little larger OD than the end of the tube that isn't knurled.  LOTS of remove material/test fit.  I am 1" away from having the grip all the way on with a nice snug fit and some hairspray for lube/glue.  I had to take a beer break and post.  If you have the tamer and are thinking of doing these do yourself a favor and take the tube off and take it to a bench belt sander instead of leaving it on the bike like I did.