This post is half in jest but there is a grain of truth to it.  As I was lugging a large Olivetti-Underwood 21 in case and sensed how heavy it felt, I realized that I do this a lot and that I repeat this process often.  Maybe at 75, I tend to feel it more.  During Covid, it was probably the only exercise I got.  What most people don’t realize is that collecting typewriters is a more physical endeavor as typewriters do weigh a bit…mine weigh from 10lbs to 27lbs.  I have 22 typewriters, all with cases, in my house and I am constantly schlepping them from one room to another and going up and down the stairs to the basement where most are stored.  I do this in my attempt to rotate them to put all of them in rotation so that they get used and remain nimble.   There are a few days where I rotate two or three.  That leads to a lot of lifting. climbing and walking.  Of course, typing on them is exercise for my two fingers (yes, limited typing skills).  When I was younger, I prepared for a backpacking trip by putting a large typewriter in my backpack to practice for a Boy Scouts excursion.
In summary, you can avoid Gym fees and get in shape by collecting typewriters.  As for mental exercises, nothing beats tweaking and fixing a malfunctioning typewriter, better than doing Sudoku or crossword puzzles.  That’s how I keep mentally sharp.
 

I found some wire at the Harbor Freight store and while a tad thicker, I was able to reform it to the approximate shape of the original.  It's a bit tedious but I managed somehow. It seems to work.   Frankly not real convinced it is necessary but it only cost a dollar. One video I saw about Brother JP-1's is that some people remove these anyway because they thought it contributed to a "tinny sound".  I don't hear any difference.

I am not sure the proper term for a wire spring attached to a vibrator to lessen the impact of the type slug on the platen.  I just acquired a Brother Charger 11 with one of these that came broken.  In my mind it seems to type fine without it.  I looked at my limited collection and found two of my typers, the Galaxie 12 and the Olivetti Studio 45 do not even have these installed.  Most of my other typewriters have them.  It is not something I ever thought about before but I wonder how important they are and what their function truly is? Prevent ghosting?

When I was in the Army in 1974 working in a military hospital in NJ, one evening thieves broke in the hospital and stole all the Selectrics.  It was some type of inside job as the windows were all left unlocked.  I was the designated Officer of the Day and it happened on my watch!  I was the sole person making rounds in the whole hospital so it was easy pickings. 

Thanks Pete.  That was very helpful.  MY machine came with the Senatorial typeface and 11 cpi...I couldn't be happier.