i recently purchased a new omer T20M 110cm gun. It came with an omer AISI630 stainless steel shaft size 6.5mm. I'm going spearing away saturday and sunday this weekend and they don't have shafts there for my gun. Today i bought a spring steel rife euro shaft size 9/32 X 60 this isint the same size diameter as the omer AISI630 6.5mm is it? It seems like it might be slightly thicker. Does anyone know if omer or some one else makes a 6.5 mm springsteel shaft.? The notches on the riffe shaft are also the little fins and the omer bands have a unique metal piece that goes into the original shafts imbedded non protruding notches and it doesn't seem like it would work very well with the riffe shaft because there would be a very small metal on metal surface area with the omer band notches. I can exchange or return it tommorrow morning before i leave for my trip but i need to know soon. not sure if the dive shop has the right one tho. I'm also afraid that using a wrong size shaft might screw somthing in the gun.