https://www.surplus-electronics-sales.com/index.php?main_page=product_info&cPath=64&products_id=944&language=en
250K Ohm 15-TurnTrimpot 3006P-1-254 - $0.65
250K Ohm Trimmer, 15 Turn Multiturn-Wirewound 10% Tolerance 15 Turns (nominal) Power Rating: 3/4 Watt MFG: Bourns MPN: 3006P-1-254
ohm
https://www.ntelements.com/product/3006p-1-504/
3006P-1-504 - Nano Tech Elements Inc.
nano techelementsinc
https://www.sourceresearch.com/Store1/quickstore.cfm?ProductID=3518&do=detail
3006P-1-502 | Bourns Potentiometers / Pot. Acc. | SEALED,CERMET,3/4 inch,15 TURN,5K,10%,Side adjust,
3006P-1-502 - SEALED,CERMET,3/4 inch,15 TURN,5K,10%,Side adjust,P,Bulk Packages