So you want to build a 240 homage
Posted: April 14th, 2022, 9:51 am
I thought I would share some of the common / not so common issues faced when building a build with a 240. I’ve had a few members reach out who have encounter different issues over the last few months… here is a list
1). Stem to mainplate offset. The movement has a higher offset compared to a 649x. It’s in the neighborhood of 2.2-2.4mm. I forget the exact number.
For those that use a 6497/8 case modern style case:
Solution: machine the bezel rehaut to accommodate the depth or find a case that is meant for a thicker 6496 dial and adjust with a thinner dial.
2). Xx sent the wrong spacer…
The main plate for 240s come in 2 sizes
Alarm Non alarm 3). The movement stops when it’s in the watch
The teeth on the spring barrel just stick out beyond the back plate and can cause the movement to stop after a few mins of running. It’s hard to see… but if your spacer isn’t set up with this consideration, you will encounter this issue. In this pic. You can just barely see the teeth sticking out. What it looks like from the side. I will add to this as I get questions or if people have questions regarding 240 builds or quirks of the 240 movement.
1). Stem to mainplate offset. The movement has a higher offset compared to a 649x. It’s in the neighborhood of 2.2-2.4mm. I forget the exact number.
For those that use a 6497/8 case modern style case:
Solution: machine the bezel rehaut to accommodate the depth or find a case that is meant for a thicker 6496 dial and adjust with a thinner dial.
2). Xx sent the wrong spacer…
The main plate for 240s come in 2 sizes
Alarm Non alarm 3). The movement stops when it’s in the watch
The teeth on the spring barrel just stick out beyond the back plate and can cause the movement to stop after a few mins of running. It’s hard to see… but if your spacer isn’t set up with this consideration, you will encounter this issue. In this pic. You can just barely see the teeth sticking out. What it looks like from the side. I will add to this as I get questions or if people have questions regarding 240 builds or quirks of the 240 movement.