If it’s suppose to have a grub screw, there will be a threaded hole in the counterweight. The AQ PT 5 I owned decades ago had a friction fit counterweight.
AQ upgrade status on their tone arms consisted at times of just offering an upgraded tonearm cable. Not sure the difference between a 5 to a 6. If there is no obvious difference by looking at photos, maybe looking up a "5" could give you setup info?
I was able to download the manual by going to Library and searching AudioQuest and then Pt6. Nothing about a grub screw though, just setup instructions.
I had the Pt7 a very long time ago and don't remember a grub screw. O ring friction fit maybe? The only grub screw I recall for sure is the VTA adjust.
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