As long as you have enough room for that triangular bit to go back into the column the set amount for the iva <i think its about 3 or for inches> you can cut the rest of if you need to. Here is a bit on the other section, hope this helps. The iva rules dont like the shafts to go too much in a straight line.
http://forum.wscc.co.uk/forum/index....eering-column/
Bob