You should be able to download the PDF copy here. I don't have any videos on stropping (either with hanging leather or diamond pasted balsa strops). With a bit of searching you should be able to find some on YouTube.
If an edge has been stropped on a hanging pasted cloth or leather strop, diamond pasted balsa stropping will not really enhance the blade's edge. The hanging pasted strop put an ever-so slight convexity on the bevel. This effectively prevents the diamond paste on the balsa strop from doing its magic. This is because the balsa will not "give" to now allow the edge apex to contact the balsa and diamond paste.