C/F wing tubes

[Dan Curtis]

When using a carbon fiber wing tube can a person use the screw hold down in the wing method or are we limited to using wing holds in the fuselage?  In other words can a small block of wood be placed in each end of the tube and then the tube and wood block be drilled for a 4/40 screw (self tapping) or is the carbon fiber to prone to crack at the drilled hole??

Thanks
Dan
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