Have a look here on Bowen's site. He's done piles of them on Colts and Rugers both.
http://www.bowenclassicarms.com/workshop.html
http://www.bowenclassicarms.com/gallery.html
And here on open search.
https://www.google.com/search?q=bisley+hammer+pics&tbm=isch&source=iu&ictx=1&fir=QRX10kasTg-9ZM%253A%252CTkegf_biQvtbIM%252C_&vet=1&usg=AI4_-kQrsSqu-UoKeWj07SOkwk8P-67p6A&sa=X&ved=2ahUKEwiV58WFrcziAhVLmK0KHbOnC6IQ9QEwAHoECAUQBA#imgrc=QRX10kasTg-9ZM: