This is one of the main reasons for actually buying the metal base ones, it's just the cost making it more of a when question. The PVC ones were made with 1/2 to avoid the base being to big, but that also means the whole thing isn't as stable(needs to be staked outside) and the actual poles the dog is weaving through aren't the correct size either.
Alright, thank you for all the responses. It looks like the weaves will continue to be placed on hold until the 24 inch metal base ones can be bought. This is the best part of chaz, the amount of working knowledge that's on here.