"center line beam (pipe)" - the only part that resembles the pipe that I can think of is center bar connecting front with rear cross bars.
Can you be more descriptive or include pictures?
-- Adam Bartos
Nacra 5.0
SolCat 18 (sold)
Lake Zurich, IL --
Yogie, Are you you referring to one of the two cross members that joins the hulls, or are you describing the connecting bar that runs under the tramp? If its the forward cross member that supports the mast, it could be a trapeze line system or possibly your jib sheet setup. My Solcat has a track and block setup mounted to the top of the forward cross bar, but I don't know if all Solcats are the same. As previously suggested, post a picture and you'll get an informed response more quickly.
I had a solcat with i believe the same hole you are referring to. I never used it, but i think a bungee went through the hole to hold the trapeeze line. My other Sol Cat had the bungees running through grommets in the tramp, under the tramp, then up through the other side. Then it had little eye bolts that the trap line clipped to.
-- 70's 18' Sol Cat "Venora"
70's 18' Sol Cat "Bumblebee"
60's 14' Sailstar Tallstar sloop "Arandora"
keep it simple, a track and blocks on top of the front beam is standard and uncomplicated. i changed the double line to the jib to a larger single line. it works fine.