I had to get a replacement for my bee stinger a while ago. I believe it's 5/16x24. Best bet is go to Home Depot or hardware store, and just see what bolts fit. Make sure to thread them in carefully when trying them out to make sure you get the correct thread count. If it's the right size bolt but wrong thread count you can potentially strip the threads on the stab or weights, but if you turn it slowly it's easy to tell if it's the right one or not.