It can also be used of a ponderous experience with a lighter object. Here, the writer considers it unpleasant ('show me how much progress I was failing to make'), so it is a 'heavy' experience for him, and the machine is 'heavy'.
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dave_anonThis was understandable but didn't click for me with the word "a tape recorder."
I think there is a third meaning here: to take a heavy-handed approach to justice
dave_anon
Others will know more than I, since it is a US phrase. I guess it comes from the slightly stereotyped image of the sheriff going into the saloon bar and