Hi all, been sailing our H170 for years and love it. We recently invested in a brand new main sail and it has a few things I don't quite know what to do with and the H170 manual does not show them... 1. The tack has a heavy rope sewn into it that hangs down below the boom. Look like a great way to pull the leading edge tight as the luff often gets a bit lose after sailing in heavier weather... but how is it supposed to be rigged? It is only about 12" long and there is no hardware on the mast to tie it off - it seems too short to wrap on a cleat even if there was one close enough. Photos 1a and 1b. 2. On the trailing edge, just above the clew is a plastic block sewn on the edge with a small curled up rope attached to it. Cannot image what this is for. Photos 2a and 2b. 3. On the trailing edge near the first batten are two small plastic blocks sewn into the edge with a small rope connecting them. Again, no clue! Photo 3. Anyone know about these things? Thanks!