Sim, I use the BT Twinjector. What I do is, pull both colors into the twinjector. I loosen the balls on the end of the plungers. Then I put the twinjector on the blending block and alternate pushing on each plunger until the mold is filled. I tried taking off the crossbar once, but it didn't work as well. With the plunger balls loosened it limits how much you can push down on the plungers and gives it a really nice swirling effect.
