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To manipulate the lock dogs on a BKO style selective style lock mandrel to allow dogs to collapse and assembly to be removed from a profile, or tubing collar.

The BT “A” Probe allows upward facing lock dogs of a selective (type S) to be retracted. And the threaded box allows for a prong extension when necessary.


The “A” Probe is made up of 3 components:

1. Spindle 2. Retaining Head 3. Blade


Ensure that the probe body does not get worn down to far to prevent lock dogs from retracting properly. Rust, sand or debris in the swivel (spindle) will hamper tool operations.