[coolwhip]

I finally resorted to purchasing a variety box of 600 washers.  M6 is the size that fits most screws.  I have plenty now.  I purchased on Amazon.

Do you have a link to the specific item you purchased? I'm interested in this too

This is what I ordered through Amazon:

smile.amazon.com/gp/product/B07KQTTXSY/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

Sutemribor Nylon Flat Washer Assortment Set 600 Pieces, 9 Sizes - M2 M2.5 M3 M4 M5 M6 M8 M10 M12, Black