All of our handles will screw on to any US beer faucet lever. The threads for the leprechaun handle are in the base. Sometimes what happens when you remove your existing handle (Miller Lite) the metal ferrule unscrews from the base of the handle and stays on the faucet.
Check out the diagram on this link:
http://www.micromatic.com/product.ph...ox=parts#parts
You should only have parts #2 and #3 on top of the faucet with #6 threads exposed to screw on the leprechaun handle. The ferrule from the previous handle would be on top of part #2.
Hopefully this is the case!
Mike Godwin, Micro Matic USA, Inc. Northridge, CA