Notes regarding the usage of fonts-schraubenkiste
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To get the font to display the screwhead glyps you might need to type the following sequences which then get expanded correctly.
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The annotations in brackets are an English transliteration of the German names used.
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SL / Schlitz (slotted head)
PH / Kreutzschlitz (Philips head)
PZ / Spax (Pozidriv head)
TX / Torx
TS / Torxsicher (secure Torx)
ATX / Außentorx (external torx)
IN / Inbus (Allan key)
IS / Inbussicher (Allan key with security bolt)
SP / Spanner (tensioning screw head)
TW / Triwing
TQ / Torqset
RO / Robertson
SK / Sechskant (hexagon screw head)
VZ / Vielzahn (multi-tooth screw head)
TP / Torxplus (star-like torx variant)
TPS / Torxplussecure (torxplus with a security bolt)
STR / Star
PTL / Pentalobe
QL / Quadlobe
TTL / TorxTrilobe
CL / Clutch
ZY / Zylinder (cylinder head screw symbol)
FL / Flach (flat head screw symbol)
LK / Linse (lenticular head screw symbol)
HR / Halbrund (semi-circular head screw symbol)
SE / Senk (countersunk head screw symbol)
RS / Rundsenk (round countersunk head screw symbol)
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Note that you must use the short-hand codes to generate the screw symbols (or type out the long name. 
To create e.g. a torx symbol you would type "TX" (or "Torx") and this expands to the torx screwhead.
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For metric screwlengths just type the numbers like you would normally. Note that digits after the comma will display smaller for better readabilty.
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For imperial screwlengths you need to prepend the expression with a dot, e.g.
.5/16"*1.7/32" .
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For suggestions, improvements and typos contact <werdahias@debian.org>.
