Spent several hours trying to figure out how prop installs. Some Rotax flange prop bolt flanges need to be installed but checked with Airmaster about how deep they were supposed to seat. Determined I have to install prop bolts and flange inserts at same time or after install of prop flange inserts alone, I would be unable to insert bolts due to length and interference of gear box output. Installed the 2 inch prop extension, spinner back plate to be able to fit the cowl.
Red arrow on prop extension photo shows the prop flange lug. When properly and completely installed, the wide flange to the left will be flush to back of prop flange. However, the prop bolts must be inserted along with the "LOOSE" prop flange lugs as I believe once the lugs are completely seated, I will NOT be able to insert the long prop bolts due to the extension of the gear box output housing. Not a problem, but the fit is very precise and even with trial fitting of the spinner back plate to fit the cowlings, the lugs had to be tapped out to remove the temp bolts I have been using. Final install of prop lugs will require hard set Loctite glue which will make removal a little tricky.