It might be possible to mark lines to make two the same length (ie. follow the same procedure exactly). I don't think it is possible to mark the lines and expect them to finish at a specific length. The simple act of splicing consumes 10-20mm of length and that is variable. Every element of the splice (the loops, bury, taper, thickness of the line, the smoothing of the bury) consumes length. I have not once been able to pre-mark a splice and have it end up at a specific length. I have been able to get to within 10mm, but that's pretty poor.
It is possible and I have done it many times.
The process is as variable as much as you control the variables. It is very controllable as line is very consistent in manufacture.
I have found it necessary to achieve consistent results. I don't think it is mistaken at all, when dealing with line in a varied state of shrink prestretching is a must if you want to avoid fucking around with it later or having things go out of symmetry.
The results are so large and glaringly the opposite you could use your hand to measure them.
It's not a matter of simplicity but what process achieves what result.
As much as possible without damaging it. That said I have had good results with as low as 20kg on thin bridles. Flying lines 100-200kg +. Shock loading the line seems sufficient, a second or more is enough. You are trying to consistently get the weave tight. You will see the line change to become tighter and more stiff. Trick is to get measurements done while it is like that and avoid handling it too much, each time you kink it you'll shorten it a bit ( not permanently, but if you stretch the line again your measurement will be out).
I created a small spreadsheet of each diameter line I use that I am looking for accuracy on and how much the line shrinks due to the brummel bury, ie. the 7/64"(2.78mm) dyneema(pigtails), the 1/8"(3.18mm)dyneema(beefier pigtails) and then the flying lines I use. When you handle a straight bury, even after pulling it tight I've seen it work loose 1mm which is greater than the deviation I have with my brummels.
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