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And if/when I do this again I am most likely going to use your method.A lot of what I was posting was for others following the thread. So if they try this they will be successful.
Don't ever let it slap back.Ya, if you can verify that two tape measures read 100% the same, you could use two different tapes. But any time the tape retracts and "slaps" back, you would need to re-verify the accuracy between the two. I have always used one and it worked well for me.
All of that is good advice but if it is toed out so badly he can clearly see it and he is out of adjustment, something is WRONG. Getting a perfect measurement won't help him if he cannot adjust any further.
I confess I didn't measure mine. When I replaced the tie rod ends I adjusted it by eye. I literally eyeballed it sitting in the driveway. I knew I had less than a half mile to drive to the tire/alignment shop and the new tires were waiting for my arrival. I did explain this to the alignment tech. We shared a laugh when he told me I had nailed it, his instruments indicated it was perfect.
Regarding tape measure differences, I am guilty of letting them "slap back" on retraction. I recently struggled on a home construction project and could not understand why I could not get some of my measurements to work out. Pop helped me figure it out. He stopped me, took the 3 different tapes we were using and made me stretch them out to 20 feet. All 3 were different. Two were a result of the ends differing slightly. The third actually started "growing" at about 8 feet and was almost 3/4 inch longer at 12 feet. It was brand new and I threw it away.
Use 2 tape measures,pulled taught and compare reading front and back. I made these over and have used them for over 30 years now. No need for the store bought plates 2 pieces of 30 inch bedrail 2 identical tape measures, some bungee chords under the vehicle to hold the angle and some clothes pins to hold the loose end of the tape. I'll see if I have pics in my phone to post. I'll have to check my other phone check back if there aren't pics posted. Found some real old pics. Use 30 inch angle not 24 as pictured.see how the clothes pins hold the tapes? The bungees hold the angle against the tire. It helps to hook both bungees on the frame on one side go to the other and hook to the angle,go back to side 1 and hook your bungee to the other angle. You can use pop cans cottage cheese containers whatever to gauge same height left to right front to back of the angle just be over the sidewall bulge at the bottom.Park on sand or loose dirt if making adjustments.