Falconclaw MLB – YM ArmNeeded to mount J YM to Falconclaw MLB bridge Falconclaw MLB J YM Arm When purchasing the MLB, you will receive 2 J Arms for attaching two monoculars. If you wish to attach the J YM thermal device to the MLB, you will need this additional product. With this setup, you still have the option to use dual monoculars and the flexibility to switch the thermal device between the left and right eye. Having two MLB J YM arms would allow you to operate the MLB