if they have not sprouted in 3 days ,,I take a pair of plastic tweezers and squeeze gentle as you can from the sides to pop the seed shell open just a wee bit ,,if they are gonna come up they will after that ,,if they take in moisture and can not get the shell to open they rot buy day 5 or so if they are in a warm moist environment,, ,,I use pete moss pellets and soak them in warm water,,once good and expanded ,,I squeeze the excess water out,,and set them on a heat pad most come up in the first 24-36,,if i have ones that won't come up I do the tweezers thing ,,,note embryo's can be damaged very easily as it is a baby in it's embryo state when you crack a seed be gentle,,it can be done with no harm but takes trail and error,,as each seed take different pressure to open ,,is a last resort I use ,,if they do not come up at that point you have lost nothing but I have had good results been able to sprout many that would not have other wise,,,best of luck
More power to them, but I'm hanging high and dry... again. 
Roll on Sept!
