I always let the paint dry and the use the thinnest piece of material that I can find and wrap a single layer onto a block of stock aluminum...hardwood has worked well too. Put a light drop of thinner on the cloth and block the surface keeping the bar flat..the cloth should not be very wet, just enough to begin to remove the paint a little at a time...not enough to bleed into the painted pantograph.
Hope this helps it has always worked for me, the main thing is to let the paint dry, use a single layer of cloth and not soaking the material with thinner...almost dry to the touch.
Ben
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