Just resurrected my DU10 from Long storage and giving it a complete strip to check seals and lubrication. The hammer piston seams quite dry and I wonder what lubricant was originally used. I have both DrySlide and BreakFree and wondering which to use.
I seem to have lost my piercing cap, so if anyone has a spare that they would part with I would be interested. If not I can make my own.
Tony