[Rick Parker]

With all due respect, you live in an area with a lot of moisture. The covers are a good idea where you are. Here are a couple of retention ideas:

1. Get a couple of stainless ring terminals for each cover and insert the Monofilament line through the leg where the wire would normally go, tie a small knot in the line and either gently crimp the terminal or use super glue one each tube where the line goes through the terminal and then attach one terminal under one of the normal screws that attach the wires on the fuse block and epoxy the other end to the interior of the cover. Very neat and discreat. Keep the length (4"-6" ?) of monofilament under the cover, keep the tether length in mind so they will not potentially interfere with the throttle linkage.
2. Small amount of clear silicone as an adhesive on the areas where you filed, only necessary to remove (very infrequently) if you are checking or changing a fuse, renew as required.

Yes?