Love it! This is how people repair some very advanced systems with simple hand tools! Watch how other countries rebuild three-phase motors! It's hammers and coil winders made from scrap! Learning these hands-on techniques is gold! Never fear learning to take stuff apart! (Except radioactive stuff...don't take that stuff apart. Really, don't.)
If you are referring to the ends of the sieve bed, they are usually not glued. You will need to unscrew or cut the sieve bed, as a heat gun will not help.
We have created a new video demonstrating a jig design. Watching that video will help you understand how it was constructed. Here is the link: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WdOimY-Lc-8.html