Blue Drifter,
I’m not aware of any current website that gives the type of detailed steps and graphic assistance that can be found in the hard copy treatments. On the 1897, I’m aware of the following:
1. FIREARMS ASSEMBLEY: The NRA Guide to Rifles and Shotguns, Revised and Expanded, 1993. Winchester 1897 Shotgun, Pages 312 & 313.
2. THE GUN DIGEST BOOK OF FIREARMS ASSEMBLY/DISASSEMBLY: Part V: Shotguns, Revised Edition, by J. B. Wood, DBI Books, 1992. Winchester Model 97, Page 411 through Page 424.
The second presentation (Gun Digest) is actually better in terms of visuals and detail, than the first (NRA) treatment which is OK but it’s similar to what one would see in the American Rifleman in a one or two-page summary.
Bobby