Hello everyone! I'm a spinner in the Facebook
group that KahKiat linked above. I won't be on this forum all the time, but he asked if we could help to give some advice here, so I thought I may be able to help.
Ok, where to start? First and foremost, if you learn this technique properly, you will NOT hurt yourself, reguardless of the weight you use. People think we only use our wrist and we're injury prone. We actually turn our entire forearm to get the spin, so strain on the wrist is negligible. The reason most of us use lighter weight balls is for deflection. I want my ball to ride the outside of the rack, which with the spin, makes the pins fall sideways. 10 lbs is too light and will often fall into the channel before hitting the corner pins. I like using 11 and 12 lbs balls. Though one of my spinner friends in Singapore does use a 14lbs ball.
Plastic balls are fine with this style, and extrememly consistent on different oil. But many of us do use reactive balls. I'd recommend something not too agressive, like a Vibe. I got a particle ball, and I found myself facing oil breakdown, and wet/dry conditions, which defeats the main point of being a spinner(consistency)... I had to get it polished. The lanes don't have to be burnt up, or have any specific oil pattern for the helicopter to be effective. A ball with low reaction keeps us very consistent. I've heard that Ebonite and Hammer make balls with a special core for spinners, but they're very hard to find outside of Taiwan. But any ball can be thrown with spin on it.
I prefer using a conventional grip. I've tried fingertip, but I could not get the spin right with it. However there are some spinners that use a fingertip. It's recommended that CG be placed in the middle of the fingerspan, as per the diagram Aoiten found. With a plastic ball, the pin is CG, hence why it says "CG or WEIGHT BLOCK(pin)"... hope that clears it up for ya.
How snug you want it drilled is really personal preferance. I like mine tight enough that I don't have to squeeze the ball, but not so tight that it "pops". I don't know about an oval thumb hole, I've never tried it.
I live in the U.S. and I'm the only spinner I know of in my City, so I've had to figure a lot out on my own. I joined the Facebook
group a few months ago, and it's been great to have other spinnners to throw ideas around with. Anyone who is interested in the spinner style is more than welcome to join the group... We even have a pro from Taiwan as a member!
Sorry to be long winded, everyone. I hope this was helpful.
Oh, and if you want to make sure I actually know what I'm talking about; KahKiat already posted 3 of my videos. "Breaking 250", "Breaking in the New Ball! 243", and "6 Pack" are all me.