Are these rare?
 

I had a 42" blade given to me that had this attached at the top. I'm sure it was installed there since it was new. Looks like it added 12" additional height to the blade. Has anyone seen these before? Should I restore it and use it, or sell it? :bigthink:
CaptMax
Front side:
http://i713.photobucket.com/albums/w...Attachment.jpg

Backside of it:
http://i713.photobucket.com/albums/w...ttachment2.jpg