Hello all - I was wondering if it is possible to retrofit the new rounded style hammer to an older (1988 costruction) SIG P220 .45 ACP? As many of you can probably attest to, the older style spur hammer has a nasty way of chewing through clothing when carrying concealed. If the retrofit is possible, is it a matter of simply switching hammers, or does it require more elaborate gunsmithing? Any input is greatly appreciated.