I give up- - - -I've offered to help, and you're making excuses. The bolt wouldhold AN EXTENSION TO THE SNOUT OF THE SHAFT TO CENTER THE FAN. The four bolts would still hold the fan onto the hub. Good luck with whatever you choose to do!

Contact Stovebolkt member Pre-68 Dave for a link to the adapter that he's been selling for years. It works.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!