Automatic electric petrol mower mowing head with right/left thread 8 mm

Universal Automatic mowing head for replace in electric (petrol) handheld  mowers: Zenoah BT251, Hyundai Z 250, GC 550 with right or left (additional removable nut) thread 8 mm, maximum diameter 92 mm, no need to disassemble the spool to wind the fishing line