Thanks I have gone ahead and ordered some 2mm fiber rod. I am using as steel sleeve so after silver brazing it to the post it is permanent.
I always build like it is my SHTF answer to the Zombie Armageddon and I can bet my life on it. I also pick away at all my equipment etc and try to make it as ergonomic and reliable as I can. Like the oval orifice I could not condone such a thing and had to correct the problem. I cannot rest if when my cheek touches the stock and I am not looking right up the pipe, its wrong, and has to be corrected. I come from a hard school
Chuck