Prusa i3 Mk8 extruder Component_cooler_fan_duct_V4 + Clamp_with_dial_gauge_holder

Here the link to the appropriate dial gauge:
https://www.ebay.de/itm/Digital-Messuhr-Messger-Messbereich-25-4mm-1-inch-mm-mit-0-01-mm-0-005-Ablesung/322658719709?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649