Now you know how it should look like.

Note how the starboard single block is fitted just to the right of the middle of the plate inside the mast. The port block is further to the side. This is done to prevent the larger block and line (blue) of the first stage from rubbing against the mast.

In my system I used Top to bottom :

1 AHPC Z-shaped plate (bar in the mast) + 4 monel 4.9 mm rivets

2 ronstan RF614 shackles with a narrowed pin opening (to fit the blocks to the Z-plate)

2 Ronstan RF20101 blocks (Not the High Load types as these have no ball barings)

(red) Some 2500 mm 2-3 mm line. the most flexible line you can find with minimum 300 kg break strength and virtually no stretch

1 RF20111 block with becket(end of 2nd stage; where the three red line point to)

1 Sailsafe sheave 30 mm block (1st stage ; I still has a good 30 mm block laying around; decide yourself what you are going to use)

(Green) 2500 3 mm line; the most flexible line you can find with at least 500 kg break strength and virtually no stretch

(Blue) some nice looking medium gray 6 mm swiftcord total length I think about 9 meters but run your numbers on this yourself as well.


At the bottom of the mast are of course the three Ronstan RF20711 (NO high load as they don't have ball barings) exit blocks and two Ronstan RF 5000 can cleats with RF5005 guides

In the corner of my mainsail I currently use a ronstan RF185 lightweight wireblock. This one has no ball barings but at 300-600 kg load I don't think any small block will use its ball barings without crushing them. Ronstan blocks will transition from ball baring to sliding acetal baring at 250 kg loads. So I went cheap and just use the high load heavy duty small block I still had laying around and that I could fit in the whole in my mainsail that was specially made for it.


Wouter