Using adjustment brush at 100 % image size

I have been using the adjustment brush in ACR ver 8.1 in CS6 & CS6cc.  I can use the brush to place the mask but would like to be able to touch up the mask at 100%.  This requires that I move the image around using the hand tool, but selecting the hand tool de-selects the pin for the adjustment brush.  After moving to a new place in the image, and selecting the adjustment brush, how can I turn on the pin again to touch up the mask?

Duh, head slap here, Jeff.  I should have known that!  I'm sure that was mentioned in your excellent "Digital Negative" book.  A Senior moment I guess.  I am enjoying your "Digital Print" book now.  Well done Jeff.
Thanks for the reply,
Dennis

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