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If you have the proper sized o-ring you might try a chopstick or skinny dowel rod or the like to work it back in. They work well for me...
I'll give those tools a try. Any special way to get them back in place?
Spare "O" rings are good to have on hand. PM your address I'll send a couple, no charge. WM
Occasionally a mud wasp will fill a small opening of something stored in the garage - you name it, one day they will probably fill it in...