Z spars single line reefing chafing

[hoppy]

My boat Jessabbe has Z Spar single line reefing and last week I replaced the lines with new 10mm dynema core lines.

On our first attempt to use the first reef, the line was chafing where it leads to the mast at the foot of the boom. By the time I had it all set, the nylon (I guess) outer skin was stripped off leaving a meter or so of bare dynema line.

The old lines were larger than 10mm and were a tight fit at the foot of the boom, so I thought getting 10mm (which is what the manual specifies anyway) was a good idea.

I'm now a bit unsure whether to get the same line and try to be more cautious when reefing, in the hope of not repeating this problem, or wether change the reef setup some how or if I just should get a different type of line. Dynema outer perhaps?

Anyone had similar problems?

The reef lines were setup as z spar specified in the attached diagram.

My 2nd reef line did not suffer the same fate as the pulley wheel on the sail had gone ob, so I just used the ring on the sail, which promptly tore out ;( doh!