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I'm working on an old AS984 movement from the 1940's and cannot get the ratchet wheel screw loose.  I've soaked it in numerous solutions  and even tried taping it on my staking set to loosen the crud that is binding the screw to no avail.  I'm starting to strip the screw head and don't want to continue  without reaching out to the forum.

What are my other options?

George

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2 hours ago, PostwarO27 said:

I'm working on an old AS984 movement from the 1940's and cannot get the ratchet wheel screw loose.  I've soaked it in numerous solutions  and even tried taping it on my staking set to loosen the crud that is binding the screw to no avail.  I'm starting to strip the screw head and don't want to continue  without reaching out to the forum.

What are my other options?

George

Same issue here a couple of days ago George. As ww  and nickelsilver says, test for the common scenario of a reverse threaded screw. Feel for some movement each way. After a few experiences with them it will become second nature to test and feel for tightening and loosening of a rachet screw regardless of its threaded portion direction of up or down the screw.

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Yes, checking for LH threads was the first thing I did.  I've yet to come across a movement with LH threads in both the ratchet and crown wheels but I've only been at this a couple years so I;m sure I'll run into one eventually.

I haven't tried the heat but as soon as I'm done typing here, I will be.  I disassembled the movement as far as I could and right now I have the barrel bridged sandwiched  in between the ratchet wheel and barrel arbor and that subassembly is soaking in a ramekin of WD, which as a toolmaker by trade, was our go to solution for loosening corroded nuts and bolts.  The click is still in place to help keep the barrel from spinning when trying to loosen the screw.

 

 

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AS 984 is definitely a Left Handed ratchet wheel screw.

I made that mistake on the first one I disassembled and wound up with a snapped screw head as a prize!

I just tested a couple other AS 984 movements I have and they were also both LH ratchet screw.

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8 minutes ago, Darthkram said:

AS 984 is definitely a Left Handed ratchet wheel screw.

I made that mistake on the first one I disassembled and wound up with a snapped screw head as a prize!

I just tested a couple other AS 984 movements I have and they were also both LH ratchet screw.

I was starting to think the same thing.  I noticed that the click rotates in a different direction than all the other movmenets I've worked on.  The head of the screw is the same as a RH screw, there is no marking of sorts to alert the mechanic as to the direction of thread.

 

However I still can't budge the thing.  Its like the screw and barrel arbor are one piece.

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SUCCESS!!

I managed to separate the ratchet screw from the barrel arbor.  I ended up soaking the subassembly in CocaCola overnight and with a couple of taps on my staking set with a punch collinear with the screw axis, it loosened up the crude holding it together.  LH thread.

I'm going to mark that screw head with three lines to indicate to whoever takes it apart in the future that its a lefty.

 

Thanks for the tips y'all !!

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