It is confusing because the gasket fits like a 'top hat' under the lip of the tank ring and it tends to peel out of shape because it does not grip the ring. I used a dry surface for the gasket on the ring and a slight [U]smear of silicone grease on the tank. Then, with firm pressure the ring should ease into the tank enough to get the grub screws located. Best done in warm conditions.
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