BlueGolfer@aol.com wrote:
>
> Try retapping the hole. If that doesn't work, use a helicoil and a new screw
> to match the threads on the helicoil.
>
> Rob Kempinski
Rob,
My mechanic refuses to use the spring-like Helicoil as a thread repair for a
couple of reasons.
First, in thin metal (1/4 inch or less) there is little grip turns available,
and more pull-out load needs to be carried by the Helicoil.
Second, the thread depth for the Helicoil, using the special drill and tap for
the outer thread area, is actually so close to the original restoration thread
that little thread depth is available for the insert. OK in deeper holes, but
not in the shallower ones.
There are Thread-sert type inserts that are solid, and install with their
special tool, or just a screwdriver, that are solid. Takes a larger drill and
tap, gives adequate thread depth, and can be removed.
Another solution, depending on metal thickness and rear clearance, is the Rivnut
approach. These are made in aluminum, for light duty and easy installation, and
steel for really good hold. Needs room behind the plate for the cylinder to be
inserted, then collapsed on the surface. Steel requires special hand tool
fancier than the 'pop rivet' type tool for aluminum in the larger sizes. They
also come with 100 degree tapered heads for spreading the surface load, and
making the unit flush.
All solutions are application sensitive.
Steve
--
Steve Laifman < One first kiss, >
B9472289 < one first love, and >
< one first win, is all >
< you get in this life. >
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