Disclaimer: These videos were posted for the sole purpose of showing the disassembly/assembly of your Smith & Wesson revolver. If you’re anything like me, you’re curious about the inner workings of machinery and this is the reason these videos were posted.
I would strongly advise against anybody making any modifications that involve stoning, filing or polishing any moving parts of any firearm unless you are a qualified gunsmith. All of these parts are within specifications and are inspected at the factory both before and after installation. Any alterations can possibly result in malfunctions such as unintentional discharge when the hammer is at full cock or the firearm not firing when the trigger is pulled.
If you’re looking for a smoother lighter trigger pull, this can be obtained simply by replacing and adjusting the hammer spring without modification of any kind to any other part(s). These springs and installation instructions are available from reputable dealers. Even the simple replacement of that spring should be followed by the discharge of several hundred rounds in a safe environment to insure complete reliability of your firearm.
Please realize and abide by your own limitations and qualifications when working on your own firearms. Failure to do so can result in death or injury to yourself or others, not to mention damage to your firearm.