Glenn Allison remains the original and best 900 series. With a conventional Yellow Dot. That's your spare ball today, guys and girls! He was turned down because the lanes were blocked. When does that happen any more? Let's face it, they're all bowled on easy lanes, so Allison's is king in a lot of people's books.
I was practicing one day and throwing it pretty good, just crossing frames off on a score sheet (that'll tell you it was a while ago) and got on a bit of a roll. When I stuck a 10 pin, David Brooker on the pair to my left, jibed me "Ah, you can miss!" I said "Of course I can, why..?" He replied "You just threw 20 in a row!" Not bad with a Purple Hammer. I had no idea. Same thing happened with a Pink Hammer later that year (late 1992 or eraly 1993, I think) in a tournament at Chester Hill... In the days when they had an OB outside about 6 board. (It wasn't always a ditch...)