We have done almost the same thing as Mark.
When we drove to La Rochelle to pick up Miss Poes, we had a 20 kg Rocna
anchor and a 50 meters 8 mm manganese steel
chain in the car; and a gypsy
for the Lofrans windlass
. Amongst some other things....
It turned out that for the conversion of the windlass
to 8 mm chain you need a new gypsy plus a new cone, which they did not tell us. The Dutch Lofrans representative kindly sent us the replacement cone to La Rochelle with DHL.
50 meters 10 m chain = 118 kg
50 meters 8 mm chain = 68 kg.
of the 8 mm chain a bit higher, due to the stronger type of steel
The anchor is working OK so far.
We still have to decide what to use for 2nd anchor.