A little PCB for my PC85

[someone]

IC's often fall out from machine pin sockets thus many designs use an IC retainer clip or zip ties.

Thanks someone, unless you are bouncing around in the back of a car, good quality turned pin sockets grip well enough for use in the Microbee.
However, I was asking about Turned Pin Posts - these are needed if you need to plug in a daughter board into a Turned Pin Socket (as is the case here), normal headers are useless for this.

Ernest

Machine Pins comprise of a turned pin with an internal spring insert. Mill-Max & Samtec are leaders in this field. Have a look at their web sites for compatible mating headers. Be aware that the come in a large range of different configurations.  When one cannot rely upon the spring pressure of the machine pin socket for retention, often accompanying retention screws and screwlocks are used.