Shooting glasses and clip on iris

[fireguy976]

Anyone have information on these, and where to buy?

Preferably not the $250 to $300 Olympic versions,

ive done the black tape with a hole in it etc,

so im looking for a reasonable adjustable iris, or the type where the discs are interchangeable.

Thanks,

 

[big boar]

Years ago I bought one from Ellwood Epps made by Lyman. It was quite cheap and performed quite well though I don't really use it anymore.