This is a 15x15x40mm bubble level holder for AstroTrac 360 in EQ mode. Two M10-1.5x30mm stainless button head socket cap screws are required to assemble it. Bubble levels & M10 screws can be purchased, for example, from Amazon.
Note: a modified version V2 is add.
Der Autor hat dieses Modell als seine eigene Kreation gekennzeichnet.