Nobody makes a rear sight dovetail blank plug??

RIFLE STAINLESS STEEL DOVETAIL SLOT BLANK dovetail slot blank Buy Rifle Dovetail Slot Blank 050806101593: GunBroker is the largest seller of Gun Sights Scopes, Sights & Optics All: 1057636203 dovetail slot Then I bought a lyman blank, link is below lymansights I am trying to work the blank in with a brass punch

space 978 slot This ONYX 3D printed blank will fill the dovetail nicely Easy to install and easy to remove Pistol, optics and front sight not included,