for a 3.5 Allen wrench I took the next larger size and filed it too fit
It works fine. And amount of usage it will get is so low that it will
last a lifetime.
I did fine later in a set of Allen wrenches at Ace hardware a 3.5
included. Has many firms include Allen wrenches with an item you buy I
am awash in Allen wrenches. Than when I moved I misplaced them for a
bit. So I bought more. Wow need and allen wrench or two
Charles Nighbor
Walnut Creek, CA
USA