I just installed a Garhauer motor davit to the sstern area of our Hunter 450....attaches to 1.0" rails with sturdy mounts and has a 4:1 pulley advantage and a 150 lb capacity; removable for storage if desired; well engineered and heavy stainless steel construction; has 34" arm that moves freely; cost $320 new....great product. I also use an Edson rail motor mount that is very sturdy although costly. Garhauer #909-985-9993 in Upland, CA...also makes very good blocks, cleats, etc....ask for catalog.