Screw shorter

Screw shorter approx. 1740

Screw shorter with additional lanterns and clamped M1 screw.

A screw shortener or screw holder is a tool that allows even the smallest screws to be tightened. With this holding device, screws can either be shortened or their threaded part can be machined.

description

A screw shortener consists of a handle with a threaded insert and a small cage with a "lantern" hole into which the screws can be inserted and tightened using the handle. The screw is now fixed and can be processed further. There are usually three to five lanterns with holes 0.4 to 1.5 mm in diameter for each booklet.

The screw shortener is still used today in watchmaking .

literature

• Theodore R. Crom: Horological shop tools, 1700 to 1900 ; Melrose, Florida 1980; ISBN 0-9604888-0-4

Individual evidence

1. ↑ Lukas Stolberg: Lexicon of the pocket watch ; Carinthia Verlag; Klagenfurt 1995; ISBN 3-85378-423-2 ; P. 203