I am getting ready to replace the old non functioning “Tack Tick” wind instrument on the mast head with a new wired model. I know that the wiring will run through the mast and compression post to the bilge. I do not want to remove the mast and hope to drop the new wire down. Does anyone know how big the opening is between the mast step and the compression post? I am planning on lowering a messenger line with a short length of bicycle chain and then pulling the new wind instrument wire down. Any advice would be greatly appreciated. Thanks, Alan #189