Graflex 89 SabersMultiBoards Adaptive Chassis 3.0 (NB, Prizm 5.1, CF9 and I3)
READ HERE: http://goth-3designs.com/instructions/diy-graflex-89sabers/
Can hold all major soundboard (NB, Prizm 5.1, CF9 and I3), a 18650 Keystone battery holder, a kill slider switch and a 28mm speaker (bass or premium).
Padawan chassis - Variant 2 (Removable Battery)
Optional Soundboard cover available here
A retention screw hole is present on the 89 Graflex core on the threaded section. This hole can be used with a retention screw to secure the chassis (in which case a matching hole will have to be driller on the chassis to insert the retention screw).