I use rare earth magnets to then bolt to PVC fittings to create something I can magnetically attach to my bars that define a segment to cut that fits in my wood stove. As an example of the magnet:
https://www.magcraft.com/magcraft-n...PTAejMg5IQ7cMu5lh_GxkxpB10cQ1nVxoCr9EQAvD_BwE
Fits and transfers to every bar I own. Message me for photos. When I'm very tired - which is every time I'm building the wood pile - I love the speed and precision this inexpensive project delivers.
You should be tied enough tomorrow night to post some pictures, after the firewood pile has been built, welcome to the PFCA, Precise Firewood Cutting Association!!!!! membership is free after you buy, make, build, construct a precise firewood measuring guide, demonstrations are welcomed.