Many of us lift and carry sheets of plywood, homasote, etc. This “gripper” makes it a lot easier for me to get panels into my basement. There are cheaper types that hold sheets from the bottom, but my back won’t take it any more.
Here’s one source. They cost $40.
http://www.amazon.com/Gorilla-Gripper-44010-Panel-Carrier/dp/B
While I’m at it, here’s 2 layout-building photos. I paint plywood a dark color to see where tracks are from underneath my layout:
A silver mine spur:
