This Roamer dress watch didn’t run and the crystal was in a pretty bad shape. The movement is an MST 424, hand winder with 17 jewels. I suspected there was a problem with the endshake of the pallets or the balance staff. Just in case I needed parts, the owner managed to secure a donor movement and sent it to me. I’d date this Roamer to the 1950s.
I remove the power from the mainspring to protect the escapement from damage later on. Then I remove the balance and the pallets and store them safely. It’s a good idea to flip the movement and remove the cannon pinion at this point. Otherwise, you’ll get into trouble later when you want the lift the center wheel.