I thought of a ball pen spring but didn't think it would be strong enough. I just opened up a box of assorted springs that cost (IIRC) $5 at Home Depot and there are six spings that might work.
Just for useless info, don't downrate those ball pen springs in terms of durability! I read someplace that they are routinely tested to make sure they will work for at least 100,000 clicks.
Jim
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