An Object, a Thingamajig, Its Name Not Recalled

This page is the CodyCross answer for the clue below from Past and Present Tech, Group 1449, Puzzle 2 (Linotype Machine).

Question is: An Object, a Thingamajig, Its Name Not Recalled

and the answer is: DOOFER

Word Meaning:

DOOFER — (slang) An object whose name the speaker or writer cannot remember or does not know.

Definitions from Wiktionary.