sand paper and dremel. or build a polishing machine. i will add more here later
harbor freight sandpaper works good use one of these to store and oragnize it https://www.amazon.com/Expanding-Accordian-Organizer-Accordion-Classroom/dp/B09HS59HX8?dib=eyJ2IjoiMSJ9.lYzISzxBXkVHpEk7L8NxuhXpNvue57Lp-bKCeOj0wWKbHfNV2N3p4sY9o2FeOz0c3HuMsaPpkxZaAaEORFhgNe6Ku0JEle2pupfVxeyizxKE4-qibbt7rZnem375qEHVNrF_tVLj_ulVHADYdoNe7MIQ4AoXxlsvS8yE_UjEcgZxtQa45PGwQ5Y_79BRIe3ry5MzNbAtMoaYhu3wehg7KKY5m8iLgs93sJdmQYvlHZ056x7dAl2Noz5VR_bF3MBaFMbGe7WdZg3_N8esSoefEHB4L02FO-xsvbT10CpX4M4.f9adNTuZ_uzRQvVAPAnCDDrp3rlKDVxQC1btHzhoFO0&dib_tag=se&keywords=accordion%2Bfile%2Borganizer&qid=1780059538&sr=8-23&th=1