M_Boats: M-15 Topping Lift

Hi Fellow Sailors. My name is Paul Baker, from Orange County, California. I have an M-15 "Chili Pepper", made in 1982. I would like to install a topping lift but there is no block aloft. Any suggestions on where and how to install on the aluminum mast ? This is a great forum....I have been reading it for some time now and have learned a lot about the Mongomerys. Thanks!