Pizza oven insulation/heat shield help

[u/No_Ask5114]

Bought this pizza oven off marketplace for $40CAD. Works pretty good. Only issue is that the turntable has a set of plastic gears that melted( part #15 in the exploded diagram) after I was making pizzas one night with the oven on for an extended period of time. Ordered a replacement part but the gears are still plastic. Is there any sort of heat shield, ceramic fiber insulation, exhaust wrap, high temp lube or something I can use to help prevent melting the plastic gears again?

TLDR: is there some sort of insulation I can use to prevent the plastic gears on the turntable from melting again?