Unlike other commercial lock cylinders, figure-eight (small format) interchangeable cores require special removal techniques when keys are not available. Interchangeable cores are normally removed by inserting the control key then turning the key clockwise about 15 degrees. When the rotation...
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The first step is to locate where to drill. The manufacturer recommends between the “E” and the “S” but that won’t help you if the core does not have “BEST” stamped on it. I saved the face plate of a figure-eight core that was drilled out and use it as a locator for the proper drilling point. It is aligned with the core and an automatic punch is used to mark the location (see Figure 17). Once located the face plate is removed, use a #7 drill bit to bore a hole approximately ¼” deep (see Figure 18).
With the face plate fully penetrated (1/4” depth), use a narrow (but beefy) punch to pry the face plate off (see Figure 19). After the face plate is torn off, the control shell is exposed (see Figure 20).
The drilling with the #7 drill bit continues until all chambers have been pierced. As you drill runs through the chambers, it slightly binds revealing when the chamber is pierced. This is useful as it lets you know when to stop (see Figure 21).
The punch that was used to pry off the face plate is again used to force the control shell clockwise until it stops at the removal position (see Figure 22). The core is then pried out.
Brass shavings are removed from the back of the core then replacement core is inserted. The best method I have found to remove brass shavings is to blow them out using a long straw. Make sure and wear safety glasses before attempting this.