I recently bought a JMW-10 arm, and then some upgrade parts from VPI, to install as a second arm on a custom plinth. This arm does not require a mounting hole as do most other arms. There is a base plate for the arm that requires three machine screws to secure to an armboard or plinth. Everything for the arm itself and the connecting wires attach to this plate.
Therefore, mounting is simple: measure the base plate location position per VPI, drill three small holes for the base plate, install three screws, and set up the arm.
Therefore, mounting is simple: measure the base plate location position per VPI, drill three small holes for the base plate, install three screws, and set up the arm.