I think you should put new seal in place once you take them out. That's why I leave them in place.How do you get the seals out without damaging them?
Also, how much time do you take from "crank out of the freezer" to "completing the assembling of the second case half"?
I leave the right half in the oven when I install the crank in the left half. Then take the right half out after installing the gasket and applying a light coating of motoseal 1 to the gasket. It takes a few minutes to complete the whole process.