Jfactor wrote: ↑Fri Sep 20, 2019 6:00 pm
Getting brummels the same length is NOT hard. I've done countless sets with brummels, never without issues. The key to this is cutting all of the lines to the same length, and marking the line where you want the loop to fold. Once you do this, its easy to adjust the loop slightly right before you lock it. Since all of the lines were cut to the same length, the shrinking that occurs due to bury will all be identical.
That is true for making sets of lines. You can mark them all under the same load and cut and splice them to the same measurements. It is not true at all for making individual lines and not true if you make any errors during the marking or splicing process.
Errors can occur when passing through the two marked points, when passing the bury through, and when making the taper at the end of the bury. You only have to be one or two strands out on your pass through to end up 5mm short. Do that on each point and that's 15mm or more.
You can disassemble a brummel, but it can be a pain and it can cause more damage to the fibres.
What you can do for making individual lines is make a tester. Try and make a line to be exactly 50cm long (or whatever dimension you want). Don't forget to use a 5-10kg load on the test line and the final line. See how far short it ends up then add that distance to your measurements. You will get kind of close. You may or may not get an accurate result.
Do brummel splices all you want. But be aware that there are limitations that you should take into account if you want a quality result.
PS I have seen test videos of knots and splices being broken. The failure was always 25-50mm from the splice or break, never on the knot or splice where you would expect it to happen. It was suggested that a shock wave is passing through the line that causes the break.