According to Hobie 16 Technical info. www.cat44.com/
Was the tramp double grommeted? That will eat up line as you've got twice as many holes to string it through.
26 gromets, tramp stamped 1978, In my younger days I bought a new 18 about 1990 I traded a snowmobile for this 16 with trailor, huls and tramp fram only all other parts were stored inside sence 1991. So I am trying to put this back together.
It's a mystery. Since it looks like you're going to have to buy a longer piece of line, double grommet the center of the tramp and buy enough line to lace them up.