I purchased a National Detroit DA recently and was surprised that the
weight lock position is meant for pad removal only,
That's what the instructions said.
When I locked it and tried to sand with it that way there was hardly any
power and it didn't work very well.
I looked everywhere for a sander that was meant to run in the locked position
and couldn't find one.
I took my DA back and got a air sander that was rotary only,
no dual action, no weight or lock.
I wanted it for stripping only and this one does it much better than a DA.
I still have a regular DA and palm sander, I use all of them.

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