The Harbor Freight laminator doesn't get hot enough for the
Brother toner. In the process of raising the temperature I managed
to soften the gears to the point where they no longer turned the
rollers. Replacing the plastic gears with metal ones solves that
problem, but only if the plastic supports for the shafts are made
of a higher temperature plastic.
I am not familiar with the GBC laminator, except through reading about it here in the group, so I don't know about what kind of gears it has. If it works, don't fix it.
Harvey
What is the advantage to swapping out gears? I have been using a GBC Heatseal H212 for a number of years now with no issues. The only modification I made was to remove some guides to allow the PCB to pass through.