[VAC] Stripped threads

["Carol and Oliver Filippi" <ofilippi@xxxxxxxxxxxxx>]

Don't forget the old Heli-Coil replacement threaded insert.

The kits are not cheap (typically under $20.00) and include a special tap,
insertion device and 10 or so threaded inserts [usually stainless steel])
But you maintain the size of the original screw.  This avoids the two wrongs
to make a right syndrome.

The repair is often better than the original, especially when threads are
stripped in soft metal (aluminum, pot metal, zammac, brass, etc) as they are
replaced with stainless steel.

For those not familiar with this system, which is to repair the female
threaded part.  It works like this:
You drill out the stripped threads (with the proper size drill) then using
the special tap, cut threads for the threaded insert.  Then you screw in the
threaded insert with a special tool.  The threaded insert looks like a small
spring.  In reality, the outside thread matches the special tap, and the
inside thread matches the one that was stripped.

 Heli-Coil was the originator (like Thermos) and still makes them, although
there are now other manufacturers.  I am partial to Heli-Coil, but have used
generic brands without any problems.  These products come in both ANSI
(American) NC and NF [National Coarse, and National Fine, and Metric as
well].  Industrial fastener suppliers and auto parts suppliers typically
carry them.  Great product !

Oliver Filippi