I registered my PT50A yesterday and asked if they recommended tensioning the test fiber and that I had heard of 100 grams but couldn't confirm. Their response was yes, 100 grams. So it looks like it is official.
I did rig up a weight and clip, weight without the string is 99.98 grams, and find it way easier to load the filament with much less waste so it's something I will make and offer on my website when time permits.
Shawn, take your time. My hole was only a foot deep but now it's back to no light at the end of the tunnel.