I've recently found that some 12 V. DC can motors have *very* little torque when compared to the older open-framed sort, and it seems that even the can motors themselves vary quite a bit in torque from one model of motor to another. In fact, three of my can-motored steam locos have so little torque that you can easily stop the drivers just by pressing on them lightly with a cotton swab while you're cleaning them. (This doesn't harm the motor; just stalls it until you release the tension.)
Needlessly to say, this lack of torque severely limits the number of cars these 3 locos can pull, and I'd have already replaced the motors except that I've not been able to find anyone who sells can motors that lists their stalling torque! All that seems to be available are their dimensions and their maximum RPMs at 12 V.
So, that being the case, can anyone think of an easy way to test the stalling torque of a small electric motor, or do I just have to grab the driveshafts of the different motors and see if I can feel any difference?
A small meter such as this seems as if it would be a natural for some company such as Micro-Mark, but I can't recall ever having seen one.