Quick look: Homemade trigger pull gauge 

Homemade trigger pull gauge accessory
Made trigger pull accessory with spare bits of aluminium (cost me $0 and about 40 minutes on a Saturday morning)
Square ‘U’ channel aluminium - 16” long for LOP of most rifles
Hole for digital scales
Inclined trigger actuator - guessed angle (geometry theory)
round 8mm dia. aluminium rod, M5x30mm screw
Ground opposite faces of Nylok nut down and secured screw
Tested with Ruger 10/22
Digital scales measure in kilos (to 2 decimals), pounds (to 2 decimals) and integer ounces.
Disadvantage - my scales only lock display on constant tension not max tension - trigger break is too brief
Cameras: Sony HDR-PJ260VE, HDR-AS100V
Editing software: Corel VideoStudio Pro X7, Google Video Editor
Tripods: Cullmann 1500, Gorillapod video, Gorillapod small camera, Kaiser camera clamp
Microphones: Zoom H1 V2 Black Digital Audio Recorder
Teleprompt: Listec Promptware plus for Android (10" tablet)
Digital clapper: QuArt Studio Digital Clapper for Android
Lights: None (yet!)
I created this video and I own all rights to all content in the video.