Seiko 7A38 - by the numbers

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Forum Home > Bend it, Mend it - Mods & Wreckers > Yema N71 - seized pushers ?

amhosib
Member
Posts: 9

Hi guys, I'm cheap, I love bling.

In an earlier life I used to own some gold Rolex, Breitling chronos and Zenith el Primero's, I looked just like an used car salesman from the 80's

Humble apologise to anyone who is an used car salesperson.!

I have a couple of Yema N71 (with/without Paris on the dial), but one has seized pushers.

I know the French were "cheap" and the pushers are friction fit, any info on "unfreezing"

P.S.The taxman got the watches !

July 3, 2014 at 8:08 AM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 9127

Really, Em ? You surprise me ! :D

As you may have gathered from the number of topics in this forum section, I'm something of an avid collector of Yema N8's. 

Amazing though - I've never actually had to press out a single pusher assembly .... yet. :/


However I have had a couple of Yema N8 Spationaute III's which suffered from stuck / rusted pushers, including my very first one.

Not sure if I should admit to it on a public internet forum, because this is a bit of a bodge, really ....

But what I did was to remove the movement (and plastic Tachymeter ring) and give the pushers a tiny squirt of WD40 from both sides.

Keep working the pusher buttons and wiping away the rusty outflow, until the last squirt of WD40 comes clean.

Obviously this won't do (whatever is left of) the O-ring seals any good - but then I never suggested it, did I ? :P


July 3, 2014 at 8:36 AM Flag Quote & Reply

amhosib
Member
Posts: 9

Would a silcone based spray be better (from the rubber seals point)?

July 3, 2014 at 9:04 AM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 9127

Probably - but maybe not as effective. :/

July 3, 2014 at 9:06 AM Flag Quote & Reply

Seiko7A38
Site Owner
Posts: 9127

I knew this thread would come back to haunt me.

Whereas I still don't have any Yema N8's with seized pushers, I now find myself in a postion where I'd like to be able to swap over the pusher assemblies - where one (in a better watch case) is dinged and I potentially have better condition parts in a spare 'gash' case.

The problem being getting them out of their respective cases. :/ So I've started looking at proprietory press-in pusher removal tools.


I'm not even going to bother posting a link to the Bergeon tool, because it's typically prohibitively expensive. :roll:

Horotec offer a couple of options, in the form of their MSA 03.656 (removes and replaces) and MSA 03.654 (removal only) tools.

Cousins sell quite a few Horotec tools, but don't list these. Both Esslingers and OFrei in the States do. Esslingers being the cheaper:

http://www.esslinger.com/buttonremovingtool-frictiontubes.aspx - Horotec MSA 03.654 - $95

http://www.esslinger.com/toolforfittingandremovingbuttons.aspx - Horotec MSA 03.656 - $143.95


The only UK source I've found, so far, is an eBay seller swisswatchtool who wants £99.95 + £5.95 postage for the MSA 03.654. :o

http://www.ebay.co.uk/itm/HOROTEC-03-654-PRESS-FOR-REMOVING-PRESS-IN-PUSHERS-AND-CROWN-TUBES-/320761168768


I'll admit I was leaning towards one of these (not at his price), but now I've studied his listing photos I'm not so sure anymore.




Apart from the fact that none of the diameters of the press bits (stakes) included with it, exactly matches the Yema's - apart from the smallest, which would suffice, I'm not impressed by their nylon 'support'. Whereas it's obviously designed to prevent damage to the outside of the watch case, its 'generous' opening could possibly also result in bent case lugs - particularly on something like a 38mm Spationaute III where the pusher is close to them. If I was to buy one of these, I'd want to have my own re-designed nylon insert made.

So now instead I'm thinking about making up a simple tool myself - by modifying a miniature G clamp. 


September 7, 2014 at 4:51 AM Flag Quote & Reply

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