Blocks supplied with Furlex furling systems made by Selden. Works with any system up to 8 mm head stay. Block clamps on a 1” stanchion. A universal joint aligns the block to the furling line and the angle is fixed with two self-tapping screws (supplied). Compare with $50 plus new for one. $30 for pair https://shop-us.seldenmast.com/products/polyamide-stanchion-block-for-jib-furling-control-line-for-o25-mm-stanchions?srsltid=AfmBOorughZKEy_mASyAerqPCIsgNO6Q6vNTdyz6L64o2ZDevqj85W0r