Thanks for the info Hagar - that's cool our first pistols were the same. I didn't know there were any safety issues and haven't shot my big toe off yet so I'm leaving it just the way it is.
The safety issue is very minor and, IMHO, overkill.
The safety mod is so you can carry the gun with all cylinders loaded and not worry about it firing if you drop or bang it in some way.
With revolvers it is a good practice to leave one chamber empty and carry the gun with the hammer located over the empty cylinder. If you drop or bang it there is no bullet under the hammer to go off accidentally. Only drawback is you have one less round in your cylinder. For most the safety outweighs one less round, particularly if it is not carried for self defense.
I believe almost all new revolvers have incorporated some type of safety system so they can be safely carried with all cylinders loaded. But I am old school, all my revolvers including those for self defense are carried with the hammer on an empty chamber.