Are you sure that the/some of needles are getting past the tube? It's a steam bath here and thinking is not doing well tonight.. Ok, Found some tubes that will fit in the bore, there are two types on my bench now. First type is very thick tube about 1/8" wall and has an unwelded seam lengthwise. Those vary at 5.080 tp 5.085 then I have a single one very thin, welded seam, about .036 wall, and it is 4.955 But I need to bring up the differences in cluter BORES.. I don't know if I covered that before anywhere on hamb. Go look at my pic of two clusters; see that one needle is sticking out? where I hung the smallest washer? Ok, that is as far as the last needle will go in...it's too tight. I never found needles here to fit correctly with no gaps or no bind. So..I knew the bores were different, so I just measured the REAR bore only, on BOTH: one is 1.225 other 1.180 Why I bring this up; is there a chance you bought new needles and are the wrong "needle" diameter?? Is that what is hitting? when you try to slide the solid pin in?? Fit it up on the bench, without the trans case. Or load both ends with needles, then try the shaft a bit on each end to see if the shaft can fit? . .