If I am not mistaken......Dubro or someone like that has lead plates with braking lines on it so you can break off what you need. Just simply drill a hole in the lead and screw it into the wood. My first Speedy Bee I had the battery all the way in the nose for the correct CG. My second one ....my master piece or pieces!!!!!!!, I used the weight of the mini servos mounted near the tail feathers to ensure propper CG. What I like to do is to NOT add weight but to RE-ARRANGE everything for the CG. Look at the photo below. You can see the servos sticking out the side. I like this design. I have big hands and it was a real pain for me to get to the servos on the first one. This fall.....I will make anothe Speedy Bee from scratch. I will use a 25 in it. Probably a Magnum two stroke. I understand that they are light, dependable and they scream! I will try one out. Four stokes are heavy for Bees in my opinion. I ahve finally realized what really works on these crazy things!

Dave