The AX-2CK gives you everything you need to link any 2 Axis (X or A) pedals together into a double pedal. Included with the kit is a new and improved drive shaft linkage and a newly designed auxiliary beater assembly.
The AX-2CK simply bolts on to your existing AXIS primary pedal. Unhook the drive shaft and the 2 pedals turn back into singles. This kit even allows you to mix X and A pedals into a hybrid double pedal.