Ÿ	Drill out old threads oversize by about 3mm.

Ÿ	If the hole is open on the bottom, seal off with a piece of steel.

Ÿ	Bring to a working temperature.

Ÿ	Start at the bottom of the freshly drilled hole by rubbing the brazing rod in a circular motion vigorously around the hole, then work up to the top. Continue by pushing the rod into the hole until it is completely full of molten braze.

Ÿ	Allow to cool, then re-drill and tap.

Ÿ	This method gives a superior set of threads and is recommended for most applications.

Ÿ	Heat both the bolt and base metal until hot enough to melt the rod (see general instructions above).

Ÿ	Start at the bottom of the stripped thread by rubbing the brazing rod in a circular motion vigorously around the hole, then work up to the top.

Ÿ	Put the bolt into the hole and flow the rod around it until the hole is slightly over filled., then push the bolt fully home.

Ÿ	Allow to cool. When cool, break the bolt loose with a wrench and remove. This method will not work on small bolts simply because the torque required to remove the bolt will twist off its  head.

Ÿ	Clean thoroughly with rotary file or brush.

Ÿ	Heat the area around the hole. Tin the inside of the cleaned hole with HTS-2000 until a layer that is equivalent in thickness to the missing threads has been obtained.

Ÿ	Use a thread chaser to establish new threads when cool. Be sure to turn the engine over a number of times, with the plug missing, to exhaust any debris.