I posted this to the Facebook Antique Typewriter Maintenance group last week, but nobody had tried the shrinktube platen re-covering method on an H3K yet…
So, since nobody had tried, I needed to do it myself to make sure that the slightly larger-diameter platen would still work within the tolerances of the Hermes 3000 carriage. Fortunately, C.A. Bennett had done the DIY shrinktube method on some of her machines, and had some tubing left over that she generously sent to me to use for the experiment. The smallest roll you can buy of this stuff is 25ft, so if you do this, you may want to share the cost with a buddy unless you have 20+ platens to re-cover. (:
Easy, my 1964 Hermes 3000, has a pretty good platen in her already, but for the purposes of the experiment, she gets to be the guinea pig anyway.
Once I had the platen out, I cut a length of the shrink tube a little bit longer than the platen is. About a half-inch extra on each end.
Alternate heating the tubing with rolling the platen on a clean, smooth surface to help with uniformity. start with the creased edges of the tube so you round those out first.
When the platen cools down and you are happy with the uniformity of the covering, trim excess tubing from ends of platen and replace into machine.
So yeah, it fits just fine and works great. Not as good as a professional full re-covering like you get at J.J. Short, but it’ll do if you’re cheap. It does quiet down the typing, pads the action a bit and helps with paper-cutting. It doesn’t solve it completely, as I noticed on my Olympia SM3, whose platen I also re-covered today, but it helps.
Where do you get this magnificent stuff? You can get it in rolls of 25ft or 100ft here. Look for the 3:1 shrink tubing that is 1 1/2″ to 1/2″, the order number is HS3-150-25FT for the 25ft roll. You can get it any color you want, pretty much, but the black one I used is HS3-150-25FT-BK.