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SF 240 Keywind help
Posted: November 29th, 2021, 7:33 pm
by mountaineer
I recently purchased a keywind sf240. I cannot unscrew the knob that moves the hands.
I unscrew counterclockwise and screw loosens but doesn’t pull out. I do not want to hurt the movement.
What is the trick here?
Re: SF 240 Keywhind help
Posted: November 29th, 2021, 9:34 pm
by mountaineer
I figured it out. Had to hold the knob still while removing screw.
Two broken teeth on the ratchet wheel. Is this a big deal? Is there any other movements that have the same size wheel?
Now I just need to figure out what to do with the movement. I bought it for a low price.
-Might keep it for spare parts.
-Though about servicing, shorten pivots, putting in a case and winding with a key.
-stem conversion
Let me if you have any suggestions.
Re: SF 240 Keywind help
Posted: November 30th, 2021, 12:44 am
by Belkin12
Hamilton 917/921 ratchet wheel should fit just fine. Or even Unitas 6497/98 one, but I have to check first.
Re: SF 240 Keywind help
Posted: November 30th, 2021, 2:23 am
by Yoda
Belkin12 wrote: ↑November 30th, 2021, 12:44 am
Hamilton 917/921 ratchet wheel should fit just fine. Or even Unitas 6497/98 one, but I have to check first.
Yes, Madantique has done that a while ago.
Re: SF 240 Keywhind help
Posted: November 30th, 2021, 2:25 am
by Yoda
mountaineer wrote: ↑November 29th, 2021, 9:34 pm
I figured it out. Had to hold the knob still while removing screw.
Two broken teeth on the ratchet wheel. Is this a big deal? Is there any other movements that have the same size wheel?
Now I just need to figure out what to do with the movement. I bought it for a low price.
-Might keep it for spare parts.
-Though about servicing, shorten pivots, putting in a case and winding with a key.
-stem conversion
Let me if you have any suggestions.
You are looking at around $800 for a full conversion.