I’m afraid I need to know a little more about Keith’s requirements before I would make any suggestion. There are a number of alternatives available from multiple sources depending on the load to be controlled, budget and personal preferences. As I’m sure you know, all alternatives have pluses and minuses which should also be discussed. Unfortunately, I only have an opportunity to visit this forum once or twice a month. Therefore, in the interest of time, (Keith’s and mine) I offered to communicate directly. If I’m contacted, I’ll be happy to post a synopsis, (with Keith’s permission) of the outcome.