Last time I shot my Automag III, the plastic tube insert made a successful bid for freedom:

The hole diameter will accept a .082” drill bit but a .086” bit is too large:

So where does one find suitable plastic material from which a replacement insert can be made? I know some companies sell fiber optic rod front sights but they don’t say what size the replacement rods are?

Really cheap might be to tint Elmer’s with some food coloring and let it dry in the hole!!!

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or try some white Delrin or Nylon rod.  3/32 is only 0.09375.  If it won't compress enough, you could chuck a short piece in a drill and sand it down to fit and drive in.  

If you were worried about the sun reflecting off of the ruby, you could ask for some anti-reflection lines to be cut onto the top of the ruby.

You might try using a piece of fiber optic rod.  The kind used for front shotgun sights. (Hiviz or Truglo)

Tony

https://www.ebay.com/itm/196085977759?_skw=shot+gun+fiber+optic+sights&itmmeta=01K33Q95EQAX4PG7BS43AK9GMH&hash=item2da7a2929f:g:y6IAAOSwwk5hw~cw&itmprp=enc%3AAQAKAAABAMHg7L1Zz0LA5DYYmRTS30n%2BbFflMrGfwhf5xhF083V7m3wPbS44N2D3R1W1Fc%2BEzPsZE94qopQy8VUTONP4UG%2Fbou9cOqqSQq%2BBWoJpS3fjzVlFW3rlTaQouSuyz4h9eML7K4DNJqZRuA1H0fjIe4e3JXwuU3nMJlyfOtFEtlk2ugcZoxDq9f0cNvvqslXzJmL1kA52LWdQpl8vV6hIi2jFvfkXWGmddJd9HcRH4gt%2BSOBMtYw0jNVGkxCEu5%2B2VqkS5xDaMnUujkv6T31GFIwcZ4dgyRw27%2BKAfyV%2FDXDhIBp3ri34kRgG8CGNpa2%2B%2FD2fdRrF4UbaJ2%2Bv4HpmkZU%3D%7Ctkp%3ABk9SR8DXpPeYZg&var=495945043030" rel="nofollow - https://www.ebay.com/itm/196085977759?_skw=shot+gun+fiber+optic+sights&itmmeta=01K33Q95EQAX4PG7BS43AK9GMH&hash=item2da7a2929f:g:y6IAAOSwwk5hw~cw&itmprp=enc%3AAQAKAAABAMHg7L1Zz0LA5DYYmRTS30n%2BbFflMrGfwhf5xhF083V7m3wPbS44N2D3R1W1Fc%2BEzPsZE94qopQy8VUTONP4UG%2Fbou9cOqqSQq%2BBWoJpS3fjzVlFW3rlTaQouSuyz4h9eML7K4DNJqZRuA1H0fjIe4e3JXwuU3nMJlyfOtFEtlk2ugcZoxDq9f0cNvvqslXzJmL1kA52LWdQpl8vV6hIi2jFvfkXWGmddJd9HcRH4gt%2BSOBMtYw0jNVGkxCEu5%2B2VqkS5xDaMnUujkv6T31GFIwcZ4dgyRw27%2BKAfyV%2FDXDhIBp3ri34kRgG8CGNpa2%2B%2FD2fdRrF4UbaJ2%2Bv4HpmkZU%3D%7Ctkp%3ABk9SR8DXpPeYZg&var=495945043030

(I know that’s not a real word. But it should be. After all, what else does adhesive do?)

Bitchen idea Bruce,

Those red ruby's are used in 16mm film projectors for guides to keep the

film aligned in the track.

Steve 

Dances with AutoMags wrote: I have always considered taking a Pasadena Auto Mag barrel, with the cut-out on the front sight blade for an insert, to a Jewler and having a thin piece of red ruby cut and installed into the cut-out.    If you were worried about the sun reflecting off of the ruby, you could ask for some anti-reflection lines to be cut onto the top of the ruby. For the rear sight blade a piece of ivory, or walrus tusk, could be cut and inlaid into the "U" shaped sight outline on the blade.   This could really compliment an engraved gun. Just saying......Bruce

They are just a tidge undersized:

I will figure out a way to glue it in place, then use a knife to trim it flush with the face of the sight. 

I got two red and two green inserts. My eyes seem to pick out green better. The two white dots in the rear sight have worn away so there are just indentations there. A couple of dabs of suitable nail polish should do the trick there….