56 tube socket holder

This is a Vacuum Tube Socket holder for 56 type tube.
Can be used for other tubes with same socket dimension (i.e. EL 34).
It is intended for rapid protyping of vacuum tube amplifiers.
Thing is made in two parts: bottom and top.
The two parts are connected using self tapping screws.
Socket is connected to top part using 3mm screws.
If necessary re-drill holes.
You can check some other ideas about DIY Printed parts for tube audio in my site:
http://agalavotti.altervista.org/TubeGears/Tub