VPI Headshell weight question


So based on a recommendation from Harry (VPI), I purchased the 3g headshell weight for my Scoutmaster/Shelter 501MKII. It didn’t come with any instructions and it’s not obvious how to install it. Does it go between the headshell & cartridge or attach to the top of the headshell?

Also: I assume I re-adjust VTF so that it’s still within recommended range (i.e. Shelter manual) or is the whole point that I need to go over by 3 grams?

Thanks…
madfloyd
Yeah, I thought it was strange too. I went back and redid everything. The weight is now under the headshell and the stylus lift bar is working fine.
"I adjusted Azimuth and even lowered the arm height (looked like it was a tad higher at the pivot)."

Wouldn't you need to RAISE the tonearm at the rear after installing this weight? I am picturing a block of metal placed between my headshell and my cartridge. This would raise the tonearm at the stylus end. So, it would be lower at the pivot. No?
Any reason why I can't use a $3 Technics weight rather than the $15 VPI one. In both cases I'm talking about the one that screws in as a spacer, not the little round ones that sits atop the headshell.