Thanks for the information Richard. I am going to temporarily repair the caps with Araldite if I can unscrew the sleeves off the bodies. I thought the caps were male thread as you can see the threads through the sides of the reservoir tops but on closer examination they are female threads and the threaded sleeves have broken off the tops of the caps. As all three have broken, I wonder if that will mean that the threads on the cap sleeves have seized onto the male thread bodies. I will bring out three new reservoirs next spring.
Wilson
