I got an e-mail about this from the organisers of the website.  They want to charge a subscription to be able to view it.  Most of the info that they present is available for free on other websites, so why pay ?

Pleased to hear that you like your TM5.  You might be interested to hear that the typewriter firm I was working for in the late 1970's bought a large quantity of these as surplus from the US Air Force.  They are good machines, but we found them difficult to sell because the appearance of the Underwood 'outrigger' carriage made them look strange to customers used of Adlers, Olympias etc.  As to ribbon spools, the 'proper' spool for these only fits two makes - late Underwoods and the Imperial 70.  BUT, you can also fit these spools to post-war Remington standards although they were not designed for them.  Conversely, you can probably fit the Remington 'spool-less' ribbon to the Touchmaster, and it does look as if a previous owner has done just that.  Sorry I can't tell you if the carriage comes off easily - it is about 45 years since I last worked on one 

That's interesting.  Someone has swopped the ribbon cover for a later (1970's) one. !

The 'half slugs' are what is called a 'split typeface'.  Two typeface are literally sawn in half using a junior hacksaw and soldered on.  It is a very difficult job to do correctly, and one that many typewriter mechanics used to fear.  It looks like a very competent job.

You will probably hate this, but I have broken two (totally unrepairable and rusty) Olivetti Summa Primas for parts in the last five years.  They are an excellent source of springs, screws, nuts, knobs and feet for repairing typewriters - particularly Olivetti typewriters.