Around 72/73 he swapped the Yamaha acoustic for a Martin D28 and appeared on the Old Grey Whistle Test with Danny. The DeArmond sound-hole pickup up not stuck down by gaffa tape. The acoustic pickup was stuck just below and behind the bridge and cable taped down. DeArmond cable was routed sometimes below the sound hole and occasionally taped up and over the guitar. To fit a De Armond you use the integral wire clamp on the rear of the back plate of the pickup and a locking slide latch on the bottom, under the volume control. This latch clamps the pickup against the sound board from inside. These fixing can work loose, the sliding clamp damages the underside of the sound board and looses contact pressure with use and then the pickup can move around and will get displaced if you hit it when playing. Hence the practical useof gaffa tape to keep it in place which he deployed on his Guild D55NT and Martin D28.more
Bob Wier used a 1970s Martin D-28 acoustic guitar for "unplugged" sessions at home and during live performances. In [August of 2013](http://www.lespaulforum.com/forum/showthread.php?189717-Bob-Weir-s-345) Weir noted: "I ran away from home to cowboy for a summer and make enough money to buy a Martin D-28 from a pawn-shop."more
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