Clamp for firmware controllers 4 pins
See the video for details:
Update:

In the updated details, I increased the thickness. And also look at the new model for 8 pins: https://www.thingiverse.com/thing:3517911See also Testing Jig PCB Clamp Links to used components:

Pogo Pins - http://ali.pub/36au9y
Cylindrical-Pin - http://ali.pub/36auhc
Mini Screw - http://ali.pub/36av1r
Prototype PCB - http://ali.pub/36avb3
Spring Contacts - http://ali.pub/36aybz
PS: Pogo Pin Connector 4 Pin http://ali.pub/36b29c , with such contacts it will turn out better, probably ... I will try another time ... I did it with those that were available...Links to used tools:

NOGA deburring tool and Blades - http://ali.pub/2z2ah5
Polishing Wheel - http://ali.pub/36aupb
Drill Bits 50 pcs/Set - http://ali.pub/36awmq
USB-UART - http://ali.pub/36avl0
Buy & save with CashBack - http://ali.pub/2v0znm
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