Today's moan isn't so much a moan but a groan!!!
Back in ancient history, when I learned to tat, the old Penelope and Coats booklets never told the tatter how much thread they needed to wind onto the shuttles to make the design. In 'those' days they hedged their bets and often put 'two balls of ......' and left it at that.
Remember that back in those days too you were never told to use two shuttles. Why? Well because split rings hadn't come into general use so two shuttles weren't needed. After all, what's wrong with a shuttle and a ball if that's all you actually need Oh, one thing I might add here is that if you're going to keep dropping the ball and it keeps running away then perhaps the ball thread wound onto a shuttle will solve that problem!!!
I feel nowadays that I 'need' to put quantities on for each shuttle but I never would dream of doing that, unless asked, as I find adding in new threads is no problem AT ALL. No knots needed either.
So to work out how much thread is needed I usually tat a final motif (or whatever) having measured the thread onto the shuttles. I note the quantity on the them and then make the item. After I've finished I take the amount left over from the original quantity and that's it!!!
BUT, of course, different tatters work at different tensions so I always allow extra for 'loose' tatters. BUT I still don't think it always works!! Now I'm moaning as I hate doing that last bit for a pattern!!!!
The leaves are from Ruth Scharf's design which is to be found here although there are slight modifications as suggested by Judith Connor.