I'm rebuilding my front suspension on my crf450r...Showa twin chamber...and when I fill inner chamber, insert and tighten cartridge and try to compress damper rod into body to bleed out oil it stops 3/4 of the way and won't drain. No matter how hard I push down it won't give up any oil out of the bleed holes. When I took some of the oil out the rod went in further but stopped again before full compress. The damper rod has healthy extension and extends fully. Any ideas what is wrong?