Cracked Corn had this in a post not long ago. This dealer has the conversion kits.
www.statelinecornburners.com/
The Copper flighting on the auger is replaced with larger PVC and the bin auger motor is replaced from 4 RPM to 3 RPM. The end that goes to the burn pot auger has a nipple for air to blow up thru the burn pot. The bushing in the burn pot auger is replaced from nylon to aluminum. The fan has has a tee that part goes to the end of the bin auger flighting. There were some pictures last year, but when I went to look, they had been removed.
As far as settings, I some stated they have theirs open real far, but I have an external 6" stainless chimney with a good draft, so I keep mine about a finger tip open (maybe 1/8 open???) I don't have the screws in the bottom of mine, but I run my boiler hotter than most, I idle around 190+ degrees. I have my settings set around 90-120K BTU depending on how cold out it is. This past spring, I checked the door temps at 90K, and was reading 650 degrees! She puts out some great heat! I was mixing a little corn with this and hope to get at least a ton this year.