4 JAW WOOD LATHE CHUCK

THIS I HAVE SEEN ON EBAY.ITS  4 JAW CHUCK . ONLY PROBLEM IS THAT ITS A 3/4  INTERNAL THREAD AND MY LATHE HAS A 20 MM X 2 MM THREAD BEING A TYME LATHE CUB MODEL. SO IF I WIN IT ON EBAY I WILL MAKE A ADAPTER TO FIT THE 3/4 ON CHUCK INTERNAL AND A 20 MM X 2 MM EXTERNAL THREAD .MALE/FEMALE THREADS .WILL HAVE THE 3/4 FIT IN 4 JAW AND OTHER END 20 MM X 2 MM THREAD FIT LATHE. SO I CAN USE THE CHUCK ON MY LATHE.THIS WILL HOLD UP TO 135 MM DIAMETER. ITS ON EBAY FOR £18 .WILLING TO PAY UP TO £25 AS TO BUY CHUCK NEW FOR THE TYME CUB IS OVER £100 PLUS.THERE ARE SO MANY WAYS TO ADAPT THIS BUT WILL SEE IF I WIN IT FIRST.!