Originally Posted by
walkerwek1958
What’s even more interesting is the changes made to the bumper automatics over the years they were in production (early 40s to mid 50s). There are 3 rotor designs, and it’s obvious they increased the mass of the rotor to improve self- winding. The two later rotor designs look identical but are not interchangeable, I came across one last week that had been bodged to get the wrong rotor to work! It surprises me how durable these movements are, the rotor axle can break but doesn’t seem to wear badly, the pivots are jewelled so they don’t wear but they can get chipped or broken. Rotor axles are getting hard to source thesedays, I have 2 new ones in the spares box but once they’re gone I can’t get replacements.
Ironically, Omega’s later movements with fully rotating rotors give more problems owing to worn bushes and broken rotor axles on the 500.