|Woodwork like this can be brought back and will last another 100 yrs|
Probably number one was an alternative to the professional grade Abatron products. I only have experience with these products from Minwax, which have held up fine for the past 10 yrs where I have put them to use, for smaller cracks and voids. For a filler/putty the Minwax High Performance Wood Filler works but is sticker and harder to work with. For a consolidant/wood hardener the Minwax High Performance Wood Hardener does work. Both are available at local home stores.
Here's a link to some thoughts on these products from Historic HomeWorks, they are near the end of the page, just above the heading "Opinion".
Comments and questions are always welcome.