On Sat, 31 May 2008 09:35:32 -0700 (PDT), Viewer
wrote:

Hi,

I have a Master Lock #34 on a trailer tongue. The lock hasn't been
used in a couple of years and now it is stuck. The key inserts A-OK
and turns, but nothing happens. No feeling of the piston thing that
goes into the ball moving, nothing. I have WD-40'd and hammered away
to no avail.

I'm new to this boat (i.e. it's mine to use if I can get it running
etc.), and I'm open to any suggestions.

Thanks!

WD-40 ain't gonna do it for you.

What you need is some PB Blaster which has more solvents than WD-40
and is specifically designed for tasks like this. What's happened is
that the piston key that clips onto the lock's shackle is stuck or
rusted. It's on a spring that the keylock compresses.

Spray the heck out of the shackle, then turn the lock sideways and
spray into the keyhole. Let it soak for ten minutes or so, then tap
the lock with a hammer as you turn the key in the keylock.

Presto - unlocked.

Trust me - I've unfrozen pistons in cylinders with that stuff. Works
like a charm.