Instead of WD40 on the plastic parts, I use Silicone spray.
The features I like are that it doesn't attack plastic, it dries quickly and doesn't attract sand, mud, dirt, etc., and it actually bonds to the surface.
I've been told that Silicone (unlike WD40 that washes off) must be mechanically removed.
BTW, the Silicone spray also helps pop-up sprinkler heads that stick in the up position.
The spray is relatively low cost, and avaiable at Lowes or HOme Depot, often found on the electrical isle.
After you get the parts lossened, out, and cleaned of any debris; try it.
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