With my tool all you have to do is slide it down the nozzle, depress the boot past the knob (sticking with the foreskin theme here)and slide it over. I've been using mine for about five years now and have never had a problem.
It's made of ABS and I chose white to make it obvious against the black of the nozzle.
Mine is already cheaper than anybody else's so I can't really justify a discount at this point. At this time every one is handmade by me and I'd be loosing money if I sold the tool any cheaper, sorry.
So let me know if you want one or two. I'll drill the holes for free. Let me know where and how big.