The front of the cocking piece is the part to grind; you have to let the sear rise to keep the striker cocked. Be sure you keep the angle at 90 degrees and proceed slowly. Note that if too much metal is removed, you could have problems moving the safety out of the fire position.
But once you grind on it, the cocking piece may be unusable with the original sear, so make sure you intend for the Timney job to be permanent. Mostly those triggers go in OK with no grinding needed, so you might also check the general condition of the rifle and whether its parts are mismatched.
Jim
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