"regular mechanic's wrenches"
That's true but don't turn it BLUE or it will be come scrap iron...
grinding will take the temper right out of the tool if you don't do it with care.
Just a note about "tappet wrenches" they come in 1/2",9/16",5/8",3/4" about 12" long and about 3/16" thick,the set I have is a Craftsman but don't use them much any more because most eng.don't need to be adjusted anymore.(left over from the hot rod days)
Paul
You may want to look at buying the OFF SET type for routers,they go for 14.oo bucks ea.
about 3/16" thick, from 20mm to 26mm, about 7" long from the last bend.
Here's a snapshot of the set I have for my P.C. routers
http://www.routerforums.com/attachme...achmentid=2677
Bj