My Milksnake won't eat...

[electrochix]

I got my 1st snake about 3 weeks ago and he's a problem feeder. He's a Sinaloan Milksnake and hatched on 19/12/03. He's only had 5 feeds since hatching (4 from the breeder, 1 from me) and now hasn't ate for over 2 weeks! I've ordered a bottle of "lizard maker". Has anyone used this before? does it work?

I've been offering him a f/t every Thursday to try to get him into a regular feeding cycle but now starting to worry and don't know if I should leave him till this Thursday. Don't want to force feed him if it can be avoided.