The 10-Pound Counterweight for MYT, MX , and ME Mounts by Software Bisque:

This Software Bisque 1.5-inch Counterweight is designed to provide an additional weight of ten pounds for the MYT, MX , and ME mounts. This counterweight has a 1.5-inch bore and will not fit the standard counterweight shaft of the Paramount ME II.

OPT Product Number: SO-WEIGHT-10