Please b careful !!! and look into it.
I have a Mezz with a wavy joint. They use a proprietary 3/8 x 9 thread with it is still considerd a wood to wood connection. I have heard/read on here of people using a 3/8 x 10 instead, and that they basically forced a new threading at the end by doing so... messing up the proprietary Mezz thread, as a result of the difference.
I have a WX700 never used when I bought the cue but it will be a while till I sell it,as I need to have the ferrule buffed out as it has some visible scuff or something to make it perfect.
Their united joint may be different/work.... I have that on my Mezz PB2... but haven't tried anything else with regard to shafts on my breaker.