Generally speaking, I torque bolts on my RC cars until "they feel tight enough", which is okay for most applications, but I notice a subtle difference in the pinch in my engines depending on how much I tighten the cylinder head screws -- if I tighten the cylinder head bolts more, the pinch is reduced slightly, indicating the sleeve is being deformed slightly. This isn't a surprise -- aluminum is easy to bend -- but it's clear I really ought to be tightening my cylinder head bolts to the exact same torque every single time if possible. Unfortunately I haven't found a torque wrench suitable for use with 1/4" hex bits, or that can measure such small torque values. Can anyone suggest a good torque wrench for RC use?