We are sugaring now... we use the 5-gal. buckets too, but we just leave the lids on... well, first we take the lids off, and cut two parallel slits, from the edge of the lid toward the center. The slits are about 2 inches long and maybe 1 1/2 inches apart. This creates a flap of plastic. then we drill a small hole in the side of the bucket, up near the lip. We use the same kind of spile as the original poster, but ours have the hook to hang the bucket on at the bottom instead of the top. The hole we drill in the bucket is sized for the hanging hook, and placed so that the bucket will hang from the hook.
Then we put the lid back on, with our flap lined up with the hole, bend the flap up, and hang the bucket with the spile under the flap. The sap drips, the lid won't blow off, fewer insects get into the buckets (fewer, but we still fish some out!), and we don't have to take the lid off to dump the sap, we just pour it through the opening made by the flap.
I don't at the moment have any pictures, but could take some and try to post if anyone is interested.