I have spent all this morning re-engineering /finishing the business end of my Chinese ex denture drill! I have found out why it was discarded by the dental mechanic......he couldn’t change the hand piece....he found the Chuck mechanism a total bind. I am not surprised! I had to ream out one part of the hand piece having taken the flex shaft out...forcibly. The inside of the tube was as rough as a badgers ####! Also the circular retaining spring was way too tight. Luckily doing clock restoration I have all the tools and experience. It now works like a dream. The Chuck was just a matter of making the cut out in the hand piece smooth so the Chuck didn’t bind. I have made a simple hanger from bits I had in my outside workshop! Well we will see how it all performs! Think I have found the correct H20 hand piece.....we will see!
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