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Thanks for all the replies, especially the reminder of the valve grinding paste trick. No reaction to my soldering bit idea though. Don't y'all like it?
Specific replies:-
[quote=gordonbennet]
I suppose a bit of careful reseach and you could source a large box of these torx screws in the three or four sizes most popularly used for philips screws and replace them with torx before they become a seized in issue. [/quote]
Difficult finding anything like that here. There's the language barrier, plus there's almost no DIY.
[quote=gordonbennet]As always, a drop of coppaslip or similar on the thread and head seat where subject to water ingress works wonders. [/quote]
Antiseize is unobtainable here in non-industrial quantities. I have a tube of some aluminium-based pertex stuff that I bought in Japan, but I use it very sparingly (e.g. on brake caliper sliders) because its irreplacable locally, and because I got used to doing without it, by making my own, (though that's a bit of a chore), or using something else.
Lately I mostly use PTFE tape or polythene on "dry" threads (e.g. wheel studs). This should last for ever, and polythene seems to have a thread-locking effect (Nylock - stylee?) which could be useful on a vibrating motorcycle.
[quote=gordonbennet]I have a quite substantial cordless electric impact driver, ...it would be much too heavy in action to use on a philips screw.[/quote]
[quote=Wackyrace]The little Bosch impact driver would be ideal for the OP's problem (prior to destroying the screw heads).[/quote]
So possibly I need a small electric impact driver (as well as drilling those ones out.)
The one I link to above probably isn't very heavy duty, but it is !/2" drive.
The greater problem is getting the right bits. They show some PH bits for it, but there's no mention of JIS.
I was aware of JIS bits but I can't ever remember seeing them specifically identified at the point of sale, even in Japan.
As noted, many people, even (especially?) "professionals", and even in The Yook, aren't aware of, or couldn't care less, about the differences between cross-head bit types. That will be even truer here.
Trying to communicate such subtlties to Chinese / Taiwanese speakers who couldn't care less anyway is likely to be a doomed mission.
Maybe something like this would have done the trick.
www.amazon.com/Vessel-Megadora-Impacta-P2x150-Scre...O
Annoyingly, I was in Japan about a month ago, and bought a Vessel screwdriver. I noticed they had a lot of smaller-style manual impact drivers that aren't, AFAIK, available here, but I didn't buy any. Online sellers generally won't deliver to Taiwan, otherwise I might order one.
Re the immediate problem I'll probably end up drilling the heads off and then hope there's enough left to put mole grips on
Edited by edlithgow on 28/08/2016 at 10:05
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