17 Jul
2006
17 Jul
'06
4:12 a.m.
Chuck Guzis wrote:
On 7/16/2006 at 9:58 PM ard at p850ug1.demon.co.uk
wrote:
If I understand what you're saying, that's much like the technique
used in the oilfield called "pinging". We'd take a hammer roughly the
size of the bolt-head and just *gently* tap the head repeatedly. To the
side of the bolt if possible, but straight down works. It's a tedious
job, but I've never seen it fail, even when the bolt was swedged in.
Doc
Another trick that works very well for me is to
try tightening the bolt
slightly. Put the tool on, turn it clockwise
(assuming a right-hand
thread), then try turning it anticlockwise again. About 95% of the time,
the bolt comes right out.
When we work with stuck valve caps, etc. on brass instruments, rather than
apply force using something like a strap wrench, what works better is a
tangential blow with a hammer (rawhide head in the case of brass). The
concussive shock works where a steady torque does not--and the chances of
stripping threads or shearing bolts is much reduced.