Refurbishment Kit, Typewriter Feet for Folding Corona No.3 Portable (Full Set!)

$48.0 Buy It Now or Best Offer
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Seller Store biermeister1
(775) 100.0%,

Location: Leesburg, Virginia
Ships to: US,
Item: 174799840230

All returns accepted:ReturnsNotAccepted

This is a new listing following up on the previous individual Corona 3 feet, and Spool Nut listings. Here, you get a full rubber refurbishment kit for your Corona 3 in one bundle, now including the final missing links, the case rubber parts and spacebar rest. (ok, I’m not addressing the platen or feed rollers, these guys have that down: https://www.jjshort.com/typewriter-platen-repair.php). Each kit includes:4x Corona 3 TPU Typewriter Foot4x Corona 3 TPU “Case Rubber” (foot, spacer, pad, not sure what it’s called…)2x Corona 3 TPU Spool Nut1x Corona 3 Spacebar RestSo, the Corona 3 typewriter is from about about 100 years ago. These amazing little machines typically still work great today, except the original rubber parts are long reduced to stone or mush, or both. I designed these parts to be nearly an identical replacement, but with the advantages of modern 3D printing technology we can engineer materials that were previously impossible. I printed with NinjaFlex black TPE polymer (https://ninjatek.com/ninjaflex/), which is nearly indestructible (but a knife or scissors will cut it, just like rubber!), flexible, and pretty gripping on most surfaces. #1: Typewriter Feet. The special feature on the feet is these are printed with a solid bottom, but after a few layers for adhesion strength the top uses a 20% springy gyroid fill pattern (see the picture). The top is not load bearing, but merely slides into the socket to hold it in place, then the machine rests on the solid bottom part. The top is still super strong, but is more easily compressed to install into the typewriter, the originals were likely kind of hard to install. Some people may prefer the original dull rubber look (and I know those are also being made and sold), but I actually think this is a superior look to rubber, and the glossy finish better matches the rest of the machine. I also think these will last far longer than natural rubber without compressing or falling apart. #2: Spacebar Rest. On mine there was just a hole in the metal part below the spacebar, and by examining photos I determined there was supposed to be a rubber rest piece there to cushion spacebar use, and perhaps quiet it. This kit includes a new replacement TPU part, again specially designed with gyroid fill for soft springiness. #3: Spool Nuts. These are not needed on all machines, but when it is needed the ribbon will not advance without them. Both spools are actively rotated clockwise during typing (including the spacebar), but because they are fed from the front (left spool) and rear (right spool), this clockwise rotation causes both spools to try to pull on the ribbon. Ribbon reversal is manual, you must loosen the nut on one spool, while the other one must be tight. Both loose, no movement. Both tight, something may break as they both try to wind. These frequently are lost on these ~100 year old machines. You can’t just replace them with a matching nut (if you can find one), as the originals are quite sophisticated, actually, they have a built-in retaining clip mechanism that uses a spring force to keep pressure on the threaded rod, keeping the vibration and rotation from unscrewing the loose nut (the one that is tight will be retained by the friction from retaining the spool). ** Does your machine need spool nuts? ** As far as I can tell, the Corona 3 machines starting in about 1922 have a new design including a different ribbon system. According to a later version manual “The new Corona (serial numbers above 500,000 is equipped with an automatic ribbon reverse which makes it unnecessary for the operator to pay any attention to the ribbon save to replace it when it has been in use so long that its ink is exhausted. Both ribbon and spool used with the Automatic Reverse are slightly different from those used on earlier machines and are therefore not interchangeable.” You can download that manual here: https://site.xavier.edu/polt/typewriters/Corona3-1920.pdf. I have only used the original Corona 3 (mine), so I can only point out what I see online, later pictures on TWDB don’t seem to have spool nuts, and this manual does not describe them. I have uploaded two new photos of my machine showing what yours should look like to use these spool nuts. #4: Case Rubber. Basically, the four typewriter feet press and secure the machine on the bottom, and these four “case rubber” parts press down onto the folded metal parts on top of the machine to secure it. The old ones (dried up, missing) likely allow movement and potential damage, whereas I made these to apply slight pressure and compress. Again, 3D printing magic, 30% gyroid fill so easy to install, they stay in, and compress on the machine when you close the lid. I designed these for my own typewriter as shown, and this is an experiment to see if it’s worth my time to make some more for the community. If you have access to a 3D printer, I have shared these designs online on Thingiverse, feel free to print your own**: https://www.thingiverse.com/biermeister/designs **Note that you can’t use normal TPU, it needs to be 85A Shore Hardness or less, and this stuff is expensive and hard to deal with. PS: Ebay’s volume discount display is a bit confusing, each purchase is one complete set, so picking “1” is one set; “2” is 2 sets, etc.

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