you need an adapter for those dynatran stands. i believe that there is a 5/8" stud, and some of them have a 1/4" threading on top. check micsupply.com > "Stand fitting w/ 3/8>5/8 adapter" (866) 894-3721
or if that doesn't seem right and you think the stand has the proper threading maybe snap a couple photos of the top of the stand and the shure bar