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McDonell Miller Water Feeder Judco Push Button Switches

I went to a new customer this afternoon that said he couldn't manually add water to his steam boiler. I went over and sure enough the manual feed switch on his WF2-U-24 water feeder is not working. Unfortunately there is no bypass currently piped in there, but it will still feed automatically when needed. To my surprise, there is no replacement part for these switches through McDonnell Miller. Has anyone replaced just the manual feed switch itself? From what I've researched, I believe the part is a JUDCO J-188-2 but I just want to be sure. They are an elderly couple and I'd hate to have to replace the whole water feeder. It is in an extremely tight place and there isn't much room to pipe in a manual bypass but it would be the cheaper alternative.