Main Halyard Slippage

Recently replaced main halyard with one of 10 mm VPC. Size was recommended by rigger. Line is certainly strong enough but problem is it slips badly when under load. Clutch will not hold it. It also slips on winch – even with 4 wraps. Clutches are rated for lines as small as 8 mm and many of other lines (reef lines, uphaul, etc.) are that size and do not slip. Is problem new line that needs to be roughed up a little to hold or did I make a mistake by going to smaller size? Any suggestions ?

Stefan Leader
380 #327.


Take apart the rope clutch and look at the teeth. Bet you will find they are worn. Replacement parts are available, I ordered from Defender. One I replaced them no more slipping.  I make a point of opening the clutch when I am pulling up the main

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