This is an adjustable mount for the Euclid Probe. It fits on the Rat Rig V-Core 3.1. To mount the holder on the leadscrew constraint of the V-Core, i have remixed the constraint and used following thread inserts:
https://de.aliexpress.com/item/1005006217825443.html?spm=a2g0o.productlist.main.17.4a27NZa3NZa3HZ&algo_pvid=a9fb753e-2dbd-4d4c-8e9e-08a991c2dbb0&algo_exp_id=a9fb753e-2dbd-4d4c-8e9e-08a991c2dbb0-8&pdp_npi=4%40dis%21EUR%216.92%215.54%21%21%217.40%215.92%21%40211b812f17229325583128595e5eba%2112000036777006606%21sea%21AT%210%21ABX&curPageLogUid=YdS9CftcztMt&utparam-url=scene%3Asearch%7Cquery_from%3A
The author remixed this model.