I went ahead and removed the turnbuckles and lashed the shrouds to the chainplates.
Until I started the lashing process, where the line is pulled taut on each turn, I didn’t realize that this is effectively a multi-pulley system with the mechanical advantage increasing on each turn for the 1st 5 or 6 turns.
The shrouds are now very tight (possibly too tight). On the Loos gauge they now measure ~28 compared to 25 when secured with turnbuckles.
I used 3mm line as I think it looks better than the smaller line supplied with the kit.
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I did also experiment with adding shims in front of the 3/4” block at the base of the tabernacle in order to increase the shroud tension.
With about 3/8” additional shimming in front of the 3/4” block, once the shroud was lashed to the chainplate and the shims removed I was unable to raise the mast fully because the shrouds were so tight . While ultimately I tensioned the shrouds with just the 3/4 block this did demonstrate that the tension can be adjusted up by re-lashing with additional blocking.
Lazlo writes in link below from the CLC builders forum on how to frap or finish off the lashed line.
https://www.clcboats.com/forum/5/thread/38969.html