You were right about the quality of the metalwork. Stainless steel 316 throughout, including a a woodruff key. The slotted head (bit that sheared) was held in place with circlips. The section with the broken off plastic is also lined with plastic, acts like a nylon bush to stop metal on metal contact. Quality.
Blimey! Maybe you should get out the geiger counter and take some readings!
__________________ - "No matter how big the sea may be, sometimes two ships meet".
2018 
2018 
