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There is a kit that Sealand will send you. It replaces the spring in the mechanism and that typically fixes the problem.
Sometimes a piece of grit (don't know where it comes from) will get in/under/around the seal and it just slips over the "tool" that is supplied. I used a tooth brush, with water running, and that took care of the problem once. (Make sure you use DW's toothbrush)
As in interim, after you let it slap back, take your toe and gently lift up on the pedal. That sometimes will finalize the closing. If it works, use this method until you can get a repair kit.
If the above fails, you can use a large plastic baggie (self closing zip lock) and fill it 1/2 to 2/3 with water. Place the baggie in the bowl and it will seal the bowl well enough to keep odors and such in the tank. Have a small bucket nearby for when you have to use the toilet, and reuse the baggie.
Happy trails.
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