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There is no need for them and they are another thing to go wrong at an inopportune time.

Like you, I just changed out the msh and put in a standard mainspring etc.

On a different pistol or revolver, I'd have to see the internal workings to evaluate the possibility of the lock interfering with operation of the weapon.

Anything that can go wrong... and the worse the consequences, the more likely the failure.

Regards,
Andrew