Thats the steel end cap, right? the tool is not for that one. Unscrew it by hand and you will reveal the adjustable plate, which you cannot adjust without the tool (or two pens, which is a pain in the ass).
Thank you so much for the heads up on this deal. I just grabbed one too. I love my Nibbler XL, but the top piece keeps coming off and getting stuck way up the tube.
I don't have the new piece yet, but after two not so great sessions with the sr-71, when things were a bit seasoned and the washer was a little gummy, I noticed a dramatic improvement in vapor production. Also, I unscrewed the bottom pin a little as per thc scientific's advice earlier in this...
yup, and it burns my lip. I saw a post about a different mouthpeice that doesn't require the stupid washer. Has anyone found this for sale? I also need extra oil coils.