I also posted this on the Hammer forums, so I will just copy and paste here. Should be more people in the know here.
I have recently switched to a two handed release. I still shoot one handed at some of my spare leaves and/or to take the oil out of play. However, I was told today at the big city tournament that this was the same thing as switching hands. And they told me this right at the end of practice. I was so relaxed and striking with 3 different balls/lines in warmups.
I know PBA allows this. I'm pretty sure USBC allows it. The question is, is anyone familiar with CTF rules (Canadian)? I am still throwing with the same dominant hand - which I argued with tournament officials. And this was a SCRATCH tournament. It should matter even less.
They were confused though, because there aren't really any other 2 handed bowlers in the area. They told me they would give me a free re-entry if they misinterpreted the rules. Several other people told me to demand to see the rules, but I just decided to bowl two handed at all spares anyway. I wish I would have had one of my plastic balls there. I had several urethanes, but still a bit more movement than plastic. And seeing how I haven't practiced shooting straight two handed since I made the switch, it made it tougher.
The good news is that I was finally able to use my Epidemic throwing two handed. It's way too strong on a house shot. My Arson is the only resin ball I can throw and even that is only at one house. Mostly throwing urethane in league. I just bought a new Storm Natural to replace my old multiple drilled ball. Also got a Natural Pearl. And I have the new Blue Hammer. The Hammer seems to fit right in the middle of those two. And then my Taboo Spare if the shot is really dry.