Refurb or not: Old still air incubator, and how?

[Rooster G]

Ya, that is a tough one. Maybe use only two bolts and set the fan diagonal utilizing the two holes that have the spacers? Maybe GQF has a simple cost effective solution.

Here is an option:
http://www.gqfmfg.com/hova-bator-parts/1778-picture-window-top/

Have fun.