Don't know about in the states but over this side of the pond carrying out your own repairs on regulators is an absolute no no.
By carrying out any repairs or modifications you would become the equipment manufacturer and as such would be liable should an accident happen.
Over here repairs can only be carried out by approved companies that have all the relevant testing equipment and expertise.
Bearing in mind a new reg is cheap I wouldn't consider the potential risk worthwhile
Cheers Bob