I also have a DD. Those solenoids, as with all DD parts
, are very reasonably priced.
Mine packed up once while drifting toward a friggen volcano that was erupting, You have never seen the screwdriver jump start so fast as that day.
Later I opened the solenoid and found it really worn, arced and pitted. I drilled a hole through a large coin and made new contact washer. It lasted 8 years until I came back this side of the Atlantic and bought a spare in St Maarten, fitted it and kept the coin operated solenoid as a spare.
Get a new one is my advice. You can burn the motor
very quickly if it welds in, and you wont hear it behind a 6/71 Jimmy. No ways...