There is perhaps a way to use the oiles drymet metal bushings without any modifications. Stock the bottom bushings don't rub up against anything as the ID of the bushing is larger than the shaft of the pot.
The top bushings stock are 2mm too long. However the washer that spaces the knob head from the bracket is also 2mm thick. If you get a larger washer with an ID of 8mm instead of 6mm you can reverse the order of components so it's bushing-washer-bracket. For this I'd get a high tolerance metal washer and perhaps solder it to the bracket. The bushing's flange is just about as wide as the cutout in the knob so it shouldn't require any modification. This way you can use both metal bushings stock without the need for trimming their length.
If you'd like a quick link for all of the parts I expect you to need added to your misumi cart, just follow this:
Update quantities and delete things as needed. You should only need to buy the torque limiter if yours are damaged but if your knobs feel like like groove coaster tier I bet they're damaged.
This cart uses POM washers over the stock nylon ones because it's more self lubricating. See the next discussion post if you want to try metal bushings instead.
Quick cart link for the metal bushing conversion and fix:
Delete or update quantities as needed. If you are trimming the bushings use the POM washer from the other cart list instead, this is for the aforementioned modified components order with the washer under the bushing.
Using aftermarket metal backed bushings, such as an [https://www.oilesglobal.com/america/en/products/oiles-drymet-lf.html Oiles Drymet LFF flanged bushing], may prove to be a good long term investment for serviceability. These are steel backed sintered bronze bushings with a PTFE (teflon) coating. Go the extra mile with some grease and these might last a long time, and they are rated much higher than the 80F series in terms of durability. However, stock they don't fit, it's 2mm too long up top and 3mm too long down below. See the other discussion comments for cart links and installation instructions; you can cut them to size or change the component order.
I incorrectly documented the set screws as conical tip, which are much too aggressive tip types for holding to the shaft. It has since been corrected to a double point set screw.
How can one order from misumi without being involved with a corporation? I'm just a student but i need to buy some of these parts.