Knowing the basic process of screw timing is only part of the issue. The rest includes having a turnscrew that is properly ground to fit the slots perfectly. Otherwise you will bugger up the new screws as well. You must also know how to use that turnscrew, and how much torque is necessary to achieve "timing."
Be aware that the Galazan screw heads are often oversize in diameter, and need adjustment in that plane as well.
In addition, the gun you have may require that the screw heads be engraved once they are fit. Plain screws on a gun of higher grade than Trojan do not look correct no matter how well they are timed and given patina.
Finally, the Galazan screws are soft as delivered. The proper job is to harden the screws after they are fit and engraved.
Sorry to add more worry to a seemingly simple job. But doing the job right is the only responsible way to do it. If you are a hobbyist, it's best to have a pro handle this... as well as your troublesome "ding."
Brad Bachelder is very good.
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