Shortening Control Arms for Narrowing Track

[Realnoisy]

There is very little information on shortening the stock upper and lower control arms to narrow the track. I know they did this old school and would like to see photos of C10's with this modification. I have read about removing 1.5 out of the upper and lower to achieve the narrow track. I currently have a 65' C10 LWB with '73 C10 1.5 sectioned xmember, bagged with 2.5 spindles. I'm just curious of how this done so any photos of the type jig used, links to modification, or any input would be appreciated. I know I could buy arms and dropped members from vendors to achieve a narrower track but I'd like know more about this modification.