This counterweight shaft adapter would be a great addition to your 1600GTO mount if you frequently use it as a portable mount! The stainless steel insert will reduce the chance that you will damage the threads by cross-threading when you attach the stainless steel counterweight shaft.
The counterweight shaft adapter can be used on all 1600GTO mounts with or without absolute encoders.
Installation is super easy! Simply remove the original counterweight shaft adapter and install the new one. Keep in mind that both components were designed with a through hole into which you can insert an object (Allen wrench) to either loosen or tighten the adapter.