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If you read about the design of JIS screws and the US phillips screwdriver, they both interact to MAKE the screwdriver NOT grip the screws correctly.
The screwdrivers supplied with the bike are a P.O.S. in my opinion, but I might be inserting them in the handle wrong. I think they are more trouble than they are worth.
The JIS set, with integral handles, have worked on every screw on my bike with no damage. I was even able to do the carbs with them; however, as I stated previously, I did use a phillips bit with the MOS for the 2 screws under the frame. I put lots of pressure, so the bit didn't rotate out.
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