I have an old premier chrome snare, was so badly pitted I robbed the cast rims off it and threw the snare over head in shed. I remember the lugs had slotted rods in them.
if you post a pic i'll take a look and see if mine are same.
What year are those lugs, Dave ? Those insert housings vary a little from 60's to seventioes . The bass drum housings are too long even though they look the same at a glance . Royal Scott insert housings are thincker .... etc etc .