Hank, when Stan built my boat I asked for an additional sheave to accommodate a UPS.  I didn’t really specify the location (nor have I used it) but I’m pretty sure he located it on the forward side of the mast close to the top.  Next time I’m at the boat I can try to take a pic.

Bruce Greenwald
Ruach
Shelter Island NY

> On Jul 6, 2023, at 4:26 PM, Peter Nyberg <peter at sunnybeeches.com> wrote:
> 
> Hank,
> 
> I have a standard IMF mast, which can accommodate two halyards.  When my boat came to me recycled by GB, the port sheaves were being used for the mainsail boom topping lift, and the starboard were empty.  When I added a Doyle UPS (which I believe is similar to a Gennaker) a few years ago, I just made use of the empty sheaves to add a halyard for it.  
> 
> But, if you had empty sheaves, you probably wouldn't be asking the question.  If both port and starboard sheaves are already being used, what are they being used for?
> 
> Peter Nyberg
> Coventry, CT
> s/v Silverheels (1988/2016)
> 
>> On 2023-07-06, at 12:19:42 EDT, hankstein at aol.com wrote:
>> 
>> I would like to add a halyard for a Gennaker.   I would appreciate 
>> hearing from someone who has added a halyard as to how it was done. 
>> thanks ..
>> Hank Stein
>> R-22  1993  #113
>> 
>