Nikon TF-RM3 focus controller part for vintage Nikon Nikkor b4 mount lens !!!!

Description

Thank you for being the wonderful person that you are.
Up for sale is a
vintage Nikon TF-RM3 focus controller part
.
The design of the vintage Nikon TF-RM3 focus controller part includes two metal screws. See photos. The two metal screws enable the user to attach the focus controller part to a Nikon Nikkor S15x8.5B1 EMS20 b4 mount lens. The design of the vintage Nikon TF-RM3 focus controller part also includes a metal port. See photos. Threads are visible on the outside of the metal port. A slot is visible inside of the metal port. See photos. The design of the Nikon TF-RM3 focus controller part also includes a hard black plastic gear wheel. See photos. The hard black plastic gear wheel rotates easily. When I rotate the hard black plastic gear wheel, the slot inside of the metal port rotates. Clearly, some parts of the focus controller system are missing.
I did some searching on the Internet. I found. The metal port enables the user to attach one end of a cable to the Nikon TF-RM3 focus controller part. Apparently, a metal piece inside of the cable hooks up with the slot inside of the metal port on the vintage Nikon TF-RM3 focus controller part. The metal piece inside of the cable rotates the slot inside of the metal port. This in turn rotates the hard plastic gear wheel. The hard plastic gear wheel fits the focus ring on the lens. The rotation of the hard plastic gear wheel adjusts the focus on the lens.  The other end of the cable attaches of a Nikon TF-DM1 focus controller part. See photos.
Please understand. Only the Nikon TF-RM3 is for sale. Photos of the Nikon TF-DM1 focus controller part are included for suggested usage purposes only. Photos of the Nikon Nikkor S15x8.5B1 EMS20 b4 mount lens are included for suggested usage purposes only.
The Nikon TF-DM1 and the Nikon TF-RM3 appear to combine to make up the focus controller system. The focus controller system enables the user to adjust the focus on the Nikon Nikkor S15x8.5B1 EMS20 b4 mount lens remotely without touching the lens.
I am selling the Nikon TF-RM3 used. It appears to be in excellent working condition. However,  I do not own a Nikon TF-DM1 focus controller part. For that reason, I am unable to test the Nikon TF-RM3 focus controller part. If the buyer discovers any undisclosed defect in the Nikon TF-RM3 focus controller part, then I am happy to be able to offer eBay money back guarantee. I am betting the item still works. So if you are interested, then buy with confidence. And if I bet wrong, then you can get your money back, all of it.
Alternatively, if you have a Nikon TF-DM1 focus controller part for sale, let me know. If the price is right, then I may be interested. I wish us happiness and good health. Best Regards.