Question:

How do I prevent a crack from running past the drill hole when using the Delta Kits spring hammer to terminate a long crack?

Answer:

Be sure you drill 1/32″ past the end of the crack with the properly sized carbide bur.  The spring hammer depth gauge is set to the „minimum“ drilling depth for optimal performance but depending on the thickness of the glass you may need to drill slightly deeper. Please watch our spring hammer instructional video below, then practice drilling to different depths and popping bullseyes until you get the desired consistent results.