check out this video

this is the first in a series of 5 .. good detail and tips on how to.

https://www.youtube.com/watch?v=X13VNtfE90E

check out all 5
not said in the video, the fellow who did the video has built all types of vintage German engines.. mostly 356 and MB.. including a gulwing..

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here is the second video in the series

https://www.youtube.com/watch?v=VI4BkJ_xybw

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This is a little off the subject but in the first video it shows taking a hand grinder to the con rods to cut new notches for the tabs on the bearings. I have a set of the "good rods" that someone had previously done the exact same thing to and I have been afraid to use them thinking that the grinding could create a stress riser that would result in a very nasty failure.
Am I wrong and those rods that have been modified like that are perfectly safe to use?
Any opinions on this, Thanks

Ray