Service, Repair & Adjustment Techniques (Not Timing or Regulation)
Discussing subjects relating to servicing, making adjustments and repairs to watch parts and movements and fitting balance staffs. This section is not for timing or regulation discussion. To discuss Regulation or Timing please go here.
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By Neverenoughwatches · Posted
The UK lots can be a 404 hit or miss, 6 - 10 watches can come in anywhere from 20 - 50 quid. I once had a 404 division of 8 watches for a fraction over 30 quid, one of them was a Smiths Astral model National 17 an absolute certainty for winner contender. The crystal was scrached up to the point of being very difficult to see the brand, something triggered a gut feeling in me and it paid off. -
I just picked up this Mondaine quartz watch on tradera.com for £11. It's a non-runner so I will replace the Ronda movement (£10.95 at Cousins), polish the case, replace the case-back gasket, and replace the mineral crystal. Now, the problem is finding a suitable crystal. The original crystal is slightly domed (2.4mm thick dome), measures 36.4mm in diameter, and is 1.3mm thick at the edge. The closest I can get on CousinsUK is 36.5mm in diameter, 3.1mm thick dome, and 1.5mm thick at the edge. I think the replacement crystal would look OK, but the problem is finding a suitable glass gasket. The case diameter for the glass gasket is 36.9mm and the closest glass gasket I can find on CousinsUK is either 36.8x36.0mm or 37.0x36.2mm. I guess one of those glass gaskets could work but as you can see there's no way the 36.5mm domed crystal would fit the inner diameters of those glass gaskets. I guess I will have to give up on a domed crystal, no? So, the backup plan is to use a (1.5mm) thick flat mineral crystal as the diameters come in increments of 0.1mm. But, what glass gasket would be the better option? The one with an outer diameter of 36.8 (0.1mm too small) or the one with an outer diameter of 37.0mm (0.1mm too large). Again the case diameter for the glass gasket is 36.9mm. I believe I read or heard that the crystal diameter should be 0.1mm wider than the inner diameter of the glass gasket. Is that correct? I'm sorry for all the numbers. I've tried to make it as clear as I could. So, I'd appreciate your thoughts on this. BTW, measuring and sourcing crystals and gaskets is extremely time-consuming! 😓 -
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By RichardHarris123 · Posted
New one on me too. Is that corrosion on the crown wheel? Let us know how you get on.
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