JeffRoberts So looks like they have Nutt brakes, which would use mineral oil, I dont see any issue with draining the lines of oil if they had opened the bleed holes both on the brake handle and also the bleed hole on the brake caliper, this should let the oil run free
Question - On the brake handle there is a little screw (inbetwen the brake hand its self and the handbar - see picture) that tightens and loosen the brake handle, you adjust this with an allen key - Have you tired this? If this was tightened all the way in, the handle would be hard to pull like you say and it would also move the brake pads in the caliper right up to the disc rotor leaving mininal distance if any between them.

Try adjusting this counter clock wise?