Fun with screws!

摘要

I re-assembled the instrument using new screws because the old ones were all corroded and unsightly. Typical for an American Gompany, Tektronix used Unified Coarse (UNC) 6-32, 8-32 and 4-40 threaded screws to hold their instruments together. They used a mixture of CSK (countersunk), FH (flat head), PH (pan head) and TH (truss head - a wide version of pan head) screws. They used Keps nuts; these are the sort that have a star lock washer pre-attached to the nut.