I have a couple of solar chargers that no longer have dust caps on the battery side connector. It seems the pigtail holder gets brittle with age and is easy to break. The covers I've seen have a pigtail with 1 or 2 rings for going over the wire, but they would have to be put on by cutting the wire. The pigtail is too thin to drill and zip tie. I could zip tie (reusable type) a baggie over the connector, but kind of a hassle. Any suggestions?