This is MarColMar's IMPROVED rear sight assembly for the CETME L.
The original rear sight utilized a ridiculously small roll pin to hold the sight adjustment dial to the cross bolt.
In most kits, this cross bolt is damaged from the insertion of the roll pin at the factory, making it almost impossibly to get out and disassemble.
MarColMar solved this with a new cross bolt and adjustment dial, that utilzes a small allen head bolt, that clamps on a flat.
This makes it easy to assemble and disassemble, and is virtually indistinguishable from the original.
Simply put a drop of blue loctite on the allen head bolt, and tighten it to the flat on the cross bolt!