DCTYKE
Carrying personal knives (or tools) whilst working on an AC is an accident waiting to happen, as well as breaking regs.
We all appreciated the foreign object problems, but carring a pocket knife wasn't against the rules in my day.
We also each had our own toolkits.
There were several different schemes tried to identify the users of tools. Even to the extent of engraving each item in a toolkit.
The communal tools and shadow boards were being experimented with in ASF, but not on the sqdns.