The poor man's solution is heavy metal "L" braces screwed into the radio's
own chassis mounting holes. Go to this page and scroll down to "A Cheap and
Simple Chassis Holder" for a photo and description.

http://antiqueradio.org/MidwestDD-18.htm

Haven't tried it on a boatanchor yet, but it worked great on this heavy
18-tube chassis. Costs only a few bucks. No woodworking (or metalworking)
required. And the braces take up virtually no room when not in use.

Regards,

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html