I have seen one or two posts from readers desiring more rigidity in their X2 column. That's not to say that the X2's are weak, but it's an interesting read. Although they extended their X2, it appears that an X2 column may be strengthened in such a manner.

It's a machine translation, so keep that in mind.
http://www.systranbox.com/systran/box?systran_lp=ja_en&systran_id=SystranSoft-en&systran_url=http://homepage2.nifty.com/masamoto/SuperX2.htm&systran_f=1170295211

[Also noteworthy is, his preoccupation with wearing masks while welding and cutting. It appears that he wants to live.]