Thistlebase
Introduction to the Cunningham
A detailed technical article explaining the purpose and use of the Cunningham (or uker) hole for adjusting luff tension in mainsails, with diagrams showing proper positioning and rigging.
View original on Google Drive · page 4
The scanned issue opens in Google Drive; turn to page 4.
This is a summary. The full article text is © the Thistle Class Association — read the original scan via the link above.