Hopefully you didn't pay too much for them cos the Strada cranks are reasonably easy to get hold of. You might be ok now that you've filed it down, but I'd keep a close eye on them so that you can see any other cracks develop. Have a good look over the rest of both cranks while you're at it, especially around the pedal threads, the part where the crank gets bigger to accomodate the pedal and both ends of the fluting. Having seen someone crack one of these I'd ensure that you do this regularly.
They are most likely to snap when under greatest load, ie out of the saddle sprints, which are likely to the times when you least want a breakage.
Hopefully you didn't pay too much for them cos the Strada cranks are reasonably easy to get hold of. You might be ok now that you've filed it down, but I'd keep a close eye on them so that you can see any other cracks develop. Have a good look over the rest of both cranks while you're at it, especially around the pedal threads, the part where the crank gets bigger to accomodate the pedal and both ends of the fluting. Having seen someone crack one of these I'd ensure that you do this regularly.
They are most likely to snap when under greatest load, ie out of the saddle sprints, which are likely to the times when you least want a breakage.