You need a special spanner wrench to take the cap off the action slide, then the wood just pulls off. Check Brownells for the wrench; IIRC, it is the same as for the Model 12.
That sounds easy, but many of those old guns have the cap rusted on and the whole thing bound up by rust and dirt and old oil. The wood is probably very brittle, so be extra careful. (If something does happen, Gun Parts Corp. shows the handle in the catalog for $40 or so.)