I appreciate all the advice, but I'd still like the original questions answered.
Originally Posted by xtylertyx
~Should the inner sheath be close to the diameter of the BB i.e 7mm?
~Or should it be much larger than the diameter of the BB i.e 16mm?
~Should there be a lot of room for the foam filling?
~Should platic or metal be used for the inner sheath?
~Should platic or metal be used for the outer sheath?
~Should the outer sheath be thick or thin?
~Should the inner sheath be thick or thin?