If things are aligned correctly the column shaft will be centered in the column tube and when supported on the foot well bulkhead. If you want to add a bottom inner support spacer, ( do this out of the car ) you can use a hard rubber caster wheel a donor. You grind off the "axle rivet" grind down the outer circumference so that it fits snugly into the column tube. The center of the rubber wheel gets bored to just over the diameter of the column shaft this gets a coating of chassis grease. The rubber itself is anchored to the column with three short screws spaced 1/3 apart. NOTE : When you install a column, do not to put any forced upward pressure on the dash end of the column especially if your column has the crush cage, over time rotating the column left and right the crush cage weld WILL CRACK and become separated. This happened years ago when I ran Auto Shop program for At Risk Youth, it took some digging but I found that one of the kids had tightened the two column bolts under the dash with an air ratchet and unknowingly forced the misaligned column against the underside of the dash. When I removed the two column to dash bolts I found that they had forced the column upward slightly hence the crush collar failed as described. Lucky for me the column weld snapped loading the speedster onto a trailer.