Hi, I'm new to posting on the forum. I'm an amateur tsubashi and kodogu collector.
Most fuchi bako or fuchigashira bako I see today use elastic to secure the kodogu to a thin piece of wood that is covered with chirimen silk (or synthetic). Since elastic is a pretty recent innovation, I assume that pre-1940 bako (if they existed) held the kodogu in place in recesses or cut-outs in a thin piece of chirimen silk covered wood. I have some such bako and the recesses are about 1 cm deep, or deep enough to come up half way on the nakagoana of fuchi when inserted sideways. Danny Massey has suggested that such boxes are called otoshi bako. I am attempting to upgrade my kodogu collection and replace boxes with elastic with otoshi bako but I’m having hard time finding the chiramen silk that will stretch enough to allow a fuchi to be inserted sideways. I have ordered and received a number of old chirimen silk furoshiki, but in my hands, this silk seems to be too thick and stiff to stretch sufficiently. I have read that there are several kinds of chairmen (hitokoshi, yuzen, kinsha, rinzu, and oni) and I understand that silks are sold according to weight and range from about 5 to 30 momme (or 18.5 to 31.7 oz), but I do not know how to order silk of the weight or kind used in kodogu bako. So, I am hoping that someone might 1) confirm the correct name for bako with recesses, 2) know what pre-1940’s boxes looked like, 3) know what weight of silk I should order, 4) suggest a possible vendor, or 5) provide a link to someone who does know this admittedly esoteric stuff. Any information will be appreciated and I thank you in advance for even reading this post!