When even an Aluminum Wrench is too heavy...

 These Aluminum Wrenches were reasonably common back in the day, but were still too heavy for me.

I did test out the drilled and polished wrench before taking it on the road one trip. It worked fine, though it was a tad "springy". I never had to use the wrench in anger, on the trip, so it stayed in this pristine condition for the last 20 or so years.