What exactly is a Jewel Block??

[Joaquin Stick]

On Sat, 28 Jun 1997, Sam Shapiro wrote:

> 
> Pig Bodine's great-great-great grandfather just finished 'exercising' his 
> penis in the ship's "jewel block"(p.55)....what is a Jewel Block??  

Jewel blocks are the blocks at the ends of yards in ship's rigging through
which halyards are passed so that you can properly raise a sail. They've
got an opening just about big enough for a well-endowed proto-Pig to be
able to satisfy a nauto-erotic need.

D. Alfred "yo-ho-ho-and-a-bottle-of-rum" Fledermaus