I never had this happen but one of the 3 ball bearings on the female end of a Nelson quick connect is stuck.
I have tried soaking it in vinegar, and lubricating it with oil.
Any tricks or tips to freeing it?
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Spray some WD-40 and then try to move the balls with a piece of rubber, or with your finger wearing rubber gloves. I've used this technique to free a sensor wheel from a thermal heater clogged with mud and debris.
Thank you so much for the Silicone spray. This worked on the one of three that I found was 'stuck'. It took less time to fix this at the barn than trying to get the rubber washers in the correct way! My horse was happy that he could finally have a rinse off without losing pressure. I have a Nelson brass set that is about 12 years old. The newer ones I call 'Brasstic', because they are light weight and last about a minute. I have consistently kept all the old fittings, snaps, screw eyes over the years-some of the brass snaps are 30 years old and still work. The newer ones do not last very long. Sometimes it's good to be a bit of a hoarder.