I disagree. There are spiders that have so subtle a wobble that someone not used to looking for the signs will swear doesn't wobble. But there are no spiders that do not have the wobble.Regardless, there are spiders that do not have the wobble.
All spiders wobble. Some people may believe and even swear to you that theirs does not wobble, however, put that same snake in front of the "experts" like Kevin McCurley or Ralph Davis, or Tracy Barker - and they'll be able to show you the subtle movements that indicate a wobble is present in that animal. They've seen more spiders than anyone - and every one of them will tell you - all spiders wobble - it cannot be bred out.
Go to any show and look at how the spiders move on display and then compare that to other ball pythons.
I was at Kevin's in October for about 5 days. We talked about spiders, I got to see some of his super cool 4 and 5 and 6 banger animals. Some of them wobbled and he'd say "so - as you can tell - spider is one of the ingredients in this combo".
I know that people WANT to believe that their animal doesn't wobble, but I guarantee you - they all do. Some not noticeably to the un-trained eye, but for someone who knows what to look for - they do.