This is an easy fix.Best to remove the intermediate shaft at the bottom of the lower end of the steering column then the circlip that holds the bearing at the lower end of the column.Remove the lower and upper shafts the plastic pins in the colapsable section will be broken so put the two sections back together,it should be easy to see how far the top shaft was positioned into the lower shaft.When you have this lined up drill it with a 1/8 bit where the plastic pins were,just enough to remove the old plastic and use aluminium rivets to hold the two shafts together.It is then a matter of pashing the steering shaft back in from the top,you will probably push the lower bearing from the column as the shaft goes in but slide it back in place and replace the circlip and intermediate shaft.
I have seen many ways to repair these steering shafts from welding roll pins pop rivets wire the problem with this type repair is it wont sheer and collapse in an accident as the unit is suppose to .. I did some tests a few years back with drilling and inserting whipper sniper nylon cord and found the yellow cord duplicated a very similar force to sheer to the OME one ........FC427.......