As Jim pointed out, "working" on the secondary sear performs no useful purpose.
The result of just taking the secondary sear out, or filing it, is the hammer simply follows the bolt to lock position, and you have no energy to impart to the firing pin. Without a way to sense the locking of the bolt, and therefore getting a full strike with the hammer, you can't reliable and SAFELY perform the feat.
Second, he's right about modifying the mechanism.
[This message has been edited by Donny (edited January 21, 2000).]