I have a 1961 336SC where a sling swivel was installed at the bullseye. The old bullseye is not there and the white ring for the sling swivel was pressed into the stock. The edge of the hole is rough and needs to be filled to match the stock. What can I use to fill the gap and have it not obvious? There are some walnut fillers from Minwax and others but will they work?
The photo shows a replacement bullseye that was cut and not yet sanded to the stock and the gap that needs to be filled.
Mark

The photo shows a replacement bullseye that was cut and not yet sanded to the stock and the gap that needs to be filled.
Mark