Continued thanks to everyone who has the patience and takes the time to answer the many questions that we relatively new printers come up with. I recently asked for step-by-step instructions for installing new form rollers on my No. 4, and the replies I got were extremely helpful.
I put together a Flickr set on what I did, for the benefit of other newbies. If you see anything that needs to be corrected, please leave a comment. Thanks!