The Locking Process:

Step 1:
Through various styles of jigs, holes are drilled perpendicular to the crack. The depth of the drill out is limited by casting thickness and the amount of strength required in the fractured area. The webbing between these parallel holes are then milled out to form a slot that will accomodate the corrugated fasteners on an interferance fit basis.

Step 2:
The locks are now inserted and stacked one on top of the other until they are flush with the casting surface. Each individual lock is peened to increase it's tensile strength and insure a proper metal to metal bond.

Step 3:
After the fasteners are installed, metal studs of the same alloys are inserted into the crack, overlapping each other and ultimately filling the crack with new material.