First thing I did when I got out of the proshop business, was get a ball spinner. I got an Innovative spinner, and it's brilliant. I did have to get a power converter, but I believe it is the best investment a serious bowler can buy.
This spinner has no wobble whatsoever, even with whacked out weightblocks, will not slow down even when standing on it if you want to burn the polish in, and is safe!
I think there are a few models that some companies make in 240v now... so have a look around... For the price of 2 bowling balls, it'll become the best investment you'll make.