What size is the Allen wrench (hex-head) used to adjust the screw on the A412MWS metal windscreen?
The Allen wrench is a #2 (0.035 inch).
The 0.035" hex dimension is nearly identical to a metric 0.9 mm hex key or driver. Either should work. In some cases, a wrench be sold as a "combo" and labeled for both 0.035" and 0.9 mm.
There are at least two manufacturers of the miniature hex drivers:
- Cooper Tools
To locate a supplier of this size hex tool, use a web search engine with the following text:
"0.035 hex driver".