Welcome to the forum. Yes we'd like to see a picture of your filler. 

Me being lazy like I am, used a Winchester filler. In a Winchester barrel, on a Sharps rifle with a Walker sight and OA Bremer style checkering. What a mess, but it's my mess and I can live with it.   

Welcome to the forum!

Nice mess Wes, purty.

Being a metal guy, hating wood and all, I like the sounds of ebony as a filler, good idea.   Welcome to the forum.

GT

I like the idea of using an ebony insert. Best quality ebony is extremely dense and stabile and almost machines like high density plastic. But finding the true uniformly black Gaboon ebony is difficult. Almost all the ebony I’ve seen or worked with over the past thirty plus years has pronounced grain structure ( not good ) and brown or crème colored streaks. Gaboon Ebony trees only have black heartwood and are protected by the Lacey Act. This law shut down Gibson Guitars years ago until they could prove their inventory of Rosewood pre-dated the law. 

Some counterfeiting is also done where streaky samples are actually color blended with black shoe polish and buffing. Years ago I ran into an stash (barrel full ) of black Gaboon Ebony cut-off scraps of finest color that was used to lay a custom Holley & Ebony floor in Liberace’s  home to look like a piano keyboard. 

Talk too much Rick

The piece of ebony I have came from an aircraft company I used to work for. Rockwell International used to put some in their cockpit trim on the Turbo-Commander.

A good supply of ebony,ivory and music wire can be found  localy 
just put and ad. in your local Buy and Sell paper ,that you are looking for a parlor piano .The piano can be had for free !
To get the one you want  ,check the ivory on the keys 
it has to be made up of three pieces . the keys that have only two piaces are made of plastic 
I have had mine for a few years and and am amazed at the number of times I go get a piece