Gday Lasse
I am not sure if this is the answer but i tried it and it works for me
Now when i plait 12 strand whips handles and I am plaiting a o2 u2 o2 when i lay the last string of a pass i will then snug up the 1st , 3rd and 5th string on the same side i have just finnished laying the string If i am doing a o3u3 i will snug up 1 and 4 ,i repeat this on every string i lay also i look down the thong to see what is going on and adjust accordingly !! I know it takes abit longer but i just cant seem to get out of the habit , i plait with a vice with wooden block jaws and a bit of leather for protection , If you have a bit of spare time try this it might help you , the vice might be of help for ya to mate , i plait for about 6 to 10 inches then move the work piece closer to the vice again
Cheers mate , i hope this helps you
Bevan
If you look at my web site all the pics are before I used this method, the pic on this post is the latest whip i have done,, but all my Bosals i have plaited like this !!
www.bwrwhips.com