Thistlebase
The Chief Measurer's Column
The Chief Measurer discusses problems with standard halyard sheaves on the mast that can cause damage and jamming. He proposes that a larger sheave diameter extending properly into the groove would solve these issues while remaining compliant with class rules.
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.