Originally Posted by
Antifriction
True remarks, Duragrouch - but irrelevant if the method works (easily!), and the forces generated by asymmetry are not large enough to damage threads. Huge 2-handed wrenches are, to say the least, seldom on hand - and I reckon people who have a bench vise and clamp the spline socket in it seldom worry about gripping the bike frame on both sides to avert one-sided loads which all normal wrenches generate and which almost never matter.
Oh I agree, always try easy first. Wanna be rich? Get rich quick is better than get rich slow.
But I think in this case, the OP may be operating at the fringes of capability, and could use all the help possible; A few percent here, a few percent there, it adds up, sometimes just enough to push over the finish line. I'd be worred that a one-sided wrench could torque things enough to misalign the bottom bracket, but with two chainstays, a down tube, and a seat tube, and the wrench center is not that far offset from BB centerline, I think there's enough beef there to resist that. But a really lightweight frame, like racer steel or carbon fiber... I'd be careful about inputting a bending moment that is greater than that exerted by a stout rider. I think your chain wrench assist is within that margin, but I'd do a quick calc to know at what rim tangential force do I exceed that, and not do so.
"Missions are won or lost in the planning stages." - Neil Burnside, D/Ops