UPDATE!
Yes, I'm one person, no other creatures involved into this project (goblins, dwarfs, gnomes etc).
I bought another Seagate St157A in unknown condition but it have 5'25 mounting extension.


Funny thing: I been doing hairs yesterday to my girlfriend and realised that we are going to use cream oxidizer. Before that day I been reading about re whitening old yellow plastic (sun activity for long time) from retro PC's, consoles and so on. I read “Retr0bright” Project from Amibay too. I don't have much time to make special formula or wait for sun to use it again with cream for reversal process. I did simply test yesterday evening. I took piece of old unused yellow from sun, beige piece of damaged plastic from rear panel of desktop dell office pc. I have nothing to loose I said myself. I don't have much time to control re whitening process every 30 minuts in order to not damage it. What about if I leave that plastic for the whole night? Cream oxidizer seems to be caustic/corrosive. I left plastic with cream on it in darky room for the whole night. Today I discover that cream oxidizer make that plastic new again 😀 seriously 😀 I didn't discover any damage done to plastic by cream oxidizer - like excessive cream usage by many hours. IT SIMPLY LOOKS LIKE NEW. No other chemicals used, no special equipment been used, no need to control that process with sun rays. NOTE THAT: I used 9% cream oxidizer, there might various pecentage occur, like 2%, 6%, 9%, 12%. I do NOT recommend 12% cream oxidizer as is highly active and causes gases.
Maybe you are reading because you have Atari ST, high-end Amiga or other hard to find stuff and expensive. Of course you don't want do damage plastics, but they are still Not-So-Mellow Yellow. REMEMBER: This experiment is 100% safe, If you don't have experience and dont believe me on word, just try with unwanted piece of old yellow plastic. This is easy and cheap FIX, that's why I like to post about it. I would like to share great ideas.
Look at the result: right bottom corner of the panel I work with. You can see diference with rest of it.


ASUS P2B-F, PII 450Mhz, 128MB-SDR, 3Dfx Diamond Monster 3D II SLI, Matrox Millennium II AGP, Diamond Monster Sound MX300