I used a vacuum bagging technique to attach the wing skins to the foam core . Now I have to make the channels for the servo wires and retract pneumatic lines in the wing.

a) I was thinking of cutting out a strip of about 1/2 wide balsa skin then routing the channels for the servo wire but leaving a shelf so I can reattach a piece of balsa where I removed it.

Do you think this will weaken the wing severely?

b) Alternately I can bore a hole using a brass tube with one end cut like a hole saw teeth . However this is quite difficult to do because the tunnel I need is quite long ( about 14 inches ) . I can make a jig so it drills straight. I have done this before but on a much larger and thicker wing .The current wing half is about 22 inch and only 1 1/2 inch thick at the root and it tapers to 1/2 in at the tip.

One other question I have is whether it makes any difference to wing strength whether the cable channel is bored approx centered in the wing core or making the channel adjacent to the wing skin .

Would appreciate comments. Any other methods?

Thanks