With the recent interest in bass concertinas here on CNET, I thought some might appreciate these photos of Lachenal Contrabass EC #39216.   It is double action, the top note is middle C, and the bottom note is 2-1/2 octaves below that going down to a wonderfully and almost ominously super-low F.   The ends are 12" long and 9" high, and it's 8" across when closed. It weighs about 8.5 pounds.   I recently visited with Bernard Wrigley and as you may know he plays a sin