Hi, All;

As some of you may know from another thread, I'm in the process of disassembling a Continental O-200. While I'm not quite at the cylinder removal part yet (but close), I thought I'd see if I could break-loose the base nuts. Of course, my wrenches (standard box/combo wrenches) wouldn't fit, and sockets are out of the question.

So I ordered 1/2 & 9/16 wrenches from ACS (although they were branded as ATS wrenches - a/c tool service). Just got the 9/16 one yesterday. Ooops - it doesn't fit. Either it's too thick around the circumference so it won't fit between the cylinder base and the side of the nut or it's too thick in height to bet between the cylinder fin and over the stud.

Is this normal? Are there better-fit wrenches out there? Must one grind on brand-new wrenches a bit to get them to fit? I paid more for the ATS wrenches instead of ACS' own brand because ATS said theirs were thinner to fit where others wouldn't without having to grind them.

*sigh*
Suggestions? (and Thanks!)