cracked slide or cracked finish? g23

For surface hardened parts, there is a specific Rockwell Superficial Hardness test.
It uses a small brale penetrator to make a very small indention.
 
Clean the slide well in kerosene. Dry with a rag. Rub chalk on the suspected area, tap slide. If its cracked the kerosene will come out of the crack and show up well in the chalk.

David
 
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