This waterproof watch case back wrench opener tool is great for opening waterproof watch case backs for changing batteries or changing movements. The waterproof case back opener includes 4 sets of clamps, round, flat, square, and toothed. The is will work on most of the waterproof watches such as Seiko, Citizen, Fossil, Guess, Rolex, Tag Heuer and many more.
- Product Dimensions: 7 x 3.2 x 1.5 inches
- Shipping Weight: 8.8 ounces
- ASIN: B000HFRO8O
- California residents: Click here for Proposition 65 warning
- Item model number: Necklaces
- Date first available at Amazon.com: July 10, 2006
- Average Customer Review:
|Brand, Seller, or Collection Name||SE|
|Item weight||8 Ounces|
Top Customer Reviews
Since it's not mentioned in the description or anywhere else, let me tell you about the 4 "different" bit sets. I measured these with calipers I believe are reasonably accurate:
-- one set of round bits 1.6mm in diameter in the box, plus a second set of the same already in the tool
-- one set of round bits 2.4mm in diameter
-- two sets of bits, that at first glance, both appear to be 5.6mm wide square bits; however, one is slightly concave and the other slightly convex. I guess this is where they get away with saying there are 4 different bits/clamps. I'm not sure what manufacturing tolerances for these are; hopefully they wouldn't be too different from set to set (like 1.3mm instead of 1.6mm). All I can say is that this was what was in my set, but it's still more informative than any product description so far.
I put the jaws at their maximum and minimum, and by marking on paper & pen, then using some geometry and a ruler, figured that the widest watch case you could probably use this on is a 40mm diameter case back, and the smallest would have to be at least 20mm. This is consistent with a few other reviews that mention case back diameter. Like another reviewer mentioned, to get enough tension, the bits or pegs end up kind of angled.Read more ›
By 'Jaxa type' I guess this means that it is based on a similar 'Jaxa' tool. It must be smaller than the genuine version, since I could not open three jaws wide enough to use this wrench to open any watch in my collection, using it as intended (ie, by engaging all three jaws with the watch's caseback). At it's maximum position, I could just barely fit two jaws on the caseback of two larger diving watches, which didn't allow for as much control as I'd have liked.
Those with larger diving watches or tool watches in the ~40mm case diameter range might have a rough time, as they might not be able to engage three lugs at once, which limits the torque and stability.
The initial quality of the tool is adequate, although the materials (specifically the bits and the internal screws, are covered in a lubricant to prevent them from corroding (which will likely begin promptly once it was wiped off to actually use the tool).
The design also allows the bits to turn freely in the tool, which allows the non-symmetrical bits to spin freely, moving off their contact points, and they won't stay aligned and properly grip under load; but the round bits work well, and should work for any caseback design. Clearly, the flat sided bits can only be used in a model that locks them in place. And, each style of bit had one extra in the package to replace any that might be lost during the life of the tool, a very thoughtful feature.
The shipping was acceptably quick, but the item arrived loose in the box with no packing material or padding, save for a single inflatable pillow the size of a small sandwish bag (completely useless to protect anything).Read more ›
By the way, Amazon is the place I love to buy from.
>Easy to use and very cost effective.
>Recommend this item for watch backs which the manufacture reports use without hesitation.
Most Recent Customer Reviews
It worked well for Swiss army watch. It takes some practice to get pins lined up and they stay a bit loose in the tool.Published 4 months ago by Amazon Customer
Handy tool to have at a reasonable price. Works as it should, does the job. In the past I paid high prices to replace the battery in my vintage Omega, this does the job and I've... Read morePublished 5 months ago by Bernard
Maybe I don't know what I'm doing but this is hard to use. It doesn't adjust easily. The lugs don't want to stay in place either. Maybe with more practice...Published 7 months ago by TomX
Kind of junk.... works, but so would taping two screw drivers together. I know you pay for what you get and this only re-establishes that fact. Read morePublished 8 months ago by Hmmm......