Welcome to the Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines - Enjoy!
Not cheap but indispensable on my workbench.Thin but strong. Many times, these have been the only wrench that could get into a tight spot.https://www.amazon.com/gp/product/B00209TOAG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I found the slotted M2 at Menards, not hex, but better than Allen.