Originally Posted by barrel roll
Orly. Please enlighten, more knowledge is always good.
wgp uses wgp spec for the lower tube, to add the merlin spec they drill right up to the spacer that the valve spring sit against. i'm not even sure if they go that deep. no other way for them to do it since they using wgp blanks, if they drill deeper it would cause a hole where the front grips screw hole is.