Reply by TJU

There are a few articles on FWW on this subject. Here is a link to one of them. I had to shim my 6” jet before I upgraded and it worked great. I would try to shim your 8” before buying a 6”. You may regret buying the smaller size.

http://www.finewoodworking.com/FWNPDF/011079062.pdf
You may need a membership.

Tim

-- Although the voices aren't real they have some pretty good ideas.