Hi All,

I recently got a No8 Rifle. The rifle is in very good condition over all but when i started to look at the rear sight i discovered that it has had some form of after market modification.

It seems to have the original ladder with an after market windage adjustable "riser" (unsure of the technical name). It is fitted with a Parker Hale PH59 aperture. The only markings on the "riser" is a 4.

Does anyone know what this aftermarket attachment is? This one has a broken windage screw and i would like to try and get a replacement if possible.
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