Yes, I have a set. As useful as a chocolate teapot. If you want to further butcher already knackered screw heads and/or enjoy the juddering sensation of the drill bouncing on them, these are your chaps.
I agree about the issue with these particular extractors being too blunt fo
r the job. Sharper edged varieties might work ok.
IME, with these particular extractors and working on screws, drilling a pil
ot hole of sufficient depth and width to allow good purchase tends to risk
removing the screw head itself as the tip of the drill approaches the screw
shaft. Even if you don't end up with the screw head coming off during the
preparatory drilling of the pilot hole, the screw tends to be suffiently we
akened for the head to come off when the extractor is applied.
Bearing in mind that a seized screw tends to be so stuck-fast that the meta
l of the head pattern will mash before the screw will turn, it's no surpris
e that any process that weakens the head-shaft connection in order to get m
ore purchase will likely produce a snapped head.
These things might work better on bolts, but I have yet to enjoy success.
On 4/1/2016 6:04 AM, email@example.com wrote:
In my experience also they very rarely work. Once you drill the screw
head off, you can normally disassemble the parts, then you have a short
length of shank exposed. Apply penetrating oil and let it soak. Grip the
shank very firmly with a mole wrench. (Put a pair of flats on it if the
diameter is reasonable). That will free up most things IME. For studs
that are broken off flush, try to drill a small hole down the axis of
the stud until it breaks through at the bottom. Successively increase
the drill size until you just reach the tips of the threads in the hole.
(You can't normally get the drill exactly central, so you reach the
threads at one point). Once you have done that, apply a chisel to the
remaining stud material near the break-through point. The stud should be
sufficiently weakened that you can "collapse" the tube so that it
becomes free in the threaded hole. In extreme cases, if you have managed
to drill close to the axis, you can sometimes "unwind" the thread like a
On 31/03/2016 17:06, firstname.lastname@example.org wrote:
I have found them ok in some cases. You need to drill a hole for them
though. (you are more likely to have success on fairly substantial bolts
etc rather than normal screws)
Quite often just drilling the hole with a left handed drill bit will do
the job all by itself.
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