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Screwdriver Recommendations [message #17173] Sun, 28 August 2022 21:33 Go to next message
Benjamin_Rush is currently offline  Benjamin_Rush
Messages: 94
Registered: June 2022
Location: USA
Gruen Apprentice
Going to attempt a dial swap from a 435 to a 335, and I'm looking to pick up a few screwdrivers. As measured with calipers, the dial screws look to be 0.05mm. An I correct in thinking 0.05mm the correct size driver?

If this goes well, I'll attempt to service the 435. I'm planning to pick up a few drivers at once, but don't want to buy a full assortment just yet. What two other sizes would be the most useful drivers for disassembly/reassembly of the 435?

Horotec has a good reputation for drivers, they make a 0.05mm, so I'm currently targeting them. I looked at AF as well, but haven't yet found an official US distributor, and the AF tools on eBay are of questionable origin. Any other brands you'd recommend, and if so, where do you recommend I purchase?

In terms of tools, I'm not beholden to the Swiss, as long as the quality is there and the price is in line. Since it seems no American watchmaking tool industry remains, my first choice would be to get these from Seiko, but I haven't been able to find drivers from them in these small sizes.

Thanks in advance!
Re: Screwdriver Recommendations [message #17176 is a reply to message #17173] Mon, 29 August 2022 07:18 Go to previous messageGo to next message
Jenneke is currently offline  Jenneke
Messages: 1536
Registered: May 2013
Location: Netherlands
Gruen Authority
I have the full set from Bergeon. Bought from cousinsuk. Guess Ofrei is cheaper for the US buyers. Dont buy cheap screwdrivers. Or if you do, put the bergeon tips in them.
And get yourself a good non-magnetic tweezer…

I,ve also heard of Tslot screwdrivers from Seiko. Seems they are the best to prevent scratches.

I would advice you to first dissassemble/assemble some pocket watch movements. Or a working chinese movement (st36) before you are going to kill a Gruen. Very Happy


You can only waste time if you forget to enjoy it - Loesje
Re: Screwdriver Recommendations [message #17181 is a reply to message #17176] Tue, 30 August 2022 00:30 Go to previous messageGo to next message
Benjamin_Rush is currently offline  Benjamin_Rush
Messages: 94
Registered: June 2022
Location: USA
Gruen Apprentice
Thanks very much for the info, Jenneke.

Is anyone here able to confirm the dial screw size for these 1940s movements, and/or list the most commonly used screwdriver sizes for these 1940s movements?
Re: Screwdriver Recommendations [message #17182 is a reply to message #17181] Tue, 30 August 2022 02:15 Go to previous messageGo to next message
JackW is currently offline  JackW
Messages: 1833
Registered: May 2013
Location: Denver
Gruen Authority
General pain in the rear
Site Admin
Quality screw drivers are key, but knowing how to dress the blades is more important. I've a set of Horotec. Don't use them unless I need to lever something off. I've two sets of Bergeon now. Blades are dressed to slightly different thickness. The most common that I use.... the red and the black handle.

All I know is based on hard work & writing by others. I can only aspire to augment this body of knowledge. If I am wrong it is because of my own failings. -me

"If I have seen farther it is by standing on the shoulders of giants." - Newton
Re: Screwdriver Recommendations [message #17185 is a reply to message #17182] Tue, 30 August 2022 02:31 Go to previous messageGo to next message
Benjamin_Rush is currently offline  Benjamin_Rush
Messages: 94
Registered: June 2022
Location: USA
Gruen Apprentice
Thanks very much for the info, Jack.

JackW wrote on Mon, 29 August 2022 22:15
I've a set of Horotec. Don't use them unless I need to lever something off.
Very interesting, I've read many reviews favoring Horotec over Bergon, calling out the Horotec ball bearings.

https://www.ofrei.com/newly-redesigned-horotec-micro-ball-be aring-screwdriver-individual-sizes-replacement-blades.html

Any chance your Horotec are the reversible-tip models? Looks like Horotec have multiple grades of drivers with very different price points.

Given the cost of the screwdriver sharpening tool, I plan on starting out by switching to replacement tips as needed before I make the larger investment.

[Updated on: Tue, 30 August 2022 02:59]

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Re: Screwdriver Recommendations [message #17189 is a reply to message #17185] Tue, 30 August 2022 18:34 Go to previous messageGo to next message
Jenneke is currently offline  Jenneke
Messages: 1536
Registered: May 2013
Location: Netherlands
Gruen Authority
My set which is perfectly fine. Important to get those with the “big head” on top for stability.
/vgforum/index.php?t=getfile&id=9815&private=0


Quote:
Given the cost of the screwdriver sharpening tool, I plan on starting out by switching to replacement tips as needed before I make the larger investment.
Seen this?

there are chinese (aliexpress) alternatives for the holder. And arkansas stone (or other wetstone) is not that expensive too.


You can only waste time if you forget to enjoy it - Loesje
Re: Screwdriver Recommendations [message #17277 is a reply to message #17189] Sat, 10 September 2022 15:30 Go to previous message
Benjamin_Rush is currently offline  Benjamin_Rush
Messages: 94
Registered: June 2022
Location: USA
Gruen Apprentice
Thanks, Jenneke. I ordered a set of the Bergeon 30081 screwdrivers a la carte, 0.5, 0.8, 1.0, 1.2, and 1.6mm.

For future reference, it looks like the dial feet screws and set lever screw can be done with a 0.6mm screwdriver. The blades in the 30081 are quite soft, so I've already sharpened them a few times.

[Updated on: Mon, 26 September 2022 05:15]

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