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I have cut many rubber tank bumpers. The tank grows but doesn't get smaller that I've seen. I have two 3/4" wood for this. Set up like a tent between back of tank mount to where the fuses are in back to the flat spot. Push down on the peak and tank goes forward and it's easy.
What the others said.And, yes, maddening. I have two tanks for my Norge.Most years -- code for "lethargy & sloth" -- I swap them. Rinse the "old," and let it sit until next year. Works.Bill