I have an m923a2 with CTIS and i've encountered what i believe are grooves in the spindle where the seals ride that are too deep for the air seals to make a good seal causing a loud shrieking whistle from that hub. Any remedy for this or is it new spindle time...? and if it is, does anyone have a line on a replacement?.... i know there's a process called flame spraying where they accumulate new metal on the void of a shaft or axle, then they machine it back to spec and smooth it out., in this case providing a new surface for the seal to ride on......or possibly tig welding the grooves full with new metal and doing the same machining on a lathe. thought? thanx brothers.