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Do not remove your lid! There is no reason to do that for a gasket and they are not easy to line back up etc. I have replaced many gaskets and have never removed the lid once.
I'll throw a wrench into the thread. I removed my lid and it was easy to realign. Lift the lid, remove the springs, unbolt hinges from the lid and take it off. Mine lined up without a fuss. Maybe I just got lucky.
I replaced my gasket on a Xl and my dealer showed me how by removing the lid. Remove the two springs and bolts from bracket. Easy off and on. Not a problem with alignment, but this was on a new egg too. No warp on the hardware. Now Cen-Tex has much more experience on this subject than me so I recommend any advice from him, but the XL seems very hard to work on in the rear by the hinge without removing lid.
I would say it's nearly impossible to do a good job with out removing the lid on the XL, due to the hinge action, the lid drops below the top of the base. Did mine with no issues, had a small under bite issue anyway and sorted that out at the same
How did you preshrink?