you make one using a flatblade screwdriver, an insulated handle, and a clip lead to ground. 

Some people put resistors inline to the ground, some people connect straight to ground. keep in mind when going straight to ground, it goes POP. then its discharged. 

But also bear in mind there is dielectric absorption, so it may appear to "charge back up" a slight bit after discharge. This is due to the inefficiencies and resistences in the dielectric allowing residual charge to spread back across the plates. (dag of crt). 

So ground it, pops, keep it grounded for a bit. Then youll be fine. 

This is assuming the flyback doesnt have its own bleedoff resistor. Most do.