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Obviously I cleaned the pots first.
The pots cannot always be recovered, sometimes they need to be replaced.
At home I have Deoxit D5, CRC, isopropyl alcohol, soldering station, air soldering station, etc ..
I also Fix the logic boards.

The pots for Make Noise Maths V2 2013 are:
Taiwan ALPHA B100K R09 23 mm
Taiwan ALPHA B10K R09 23 mm

Link Aliexpress:
6fd8a430d62546ecaea93ee0a3505559_595754$96662e33cc994621b4c1eb562947ea0d&ck=in_edm_other" target="_blank">https://it.aliexpress.com/item/33034803059.html?ug_edm_item_id=33034803059&tracelog=rowan&rowan_id1=user_add_cart_remind_1_1_en_US_2020-11-01&rowan_msg_id=9129biz_add_cart6fd8a430d62546ecaea93ee0a3505559_595754$96662e33cc994621b4c1eb562947ea0d&ck=in_edm_other

You can open up your Maths and see it for yourself.

PS: kaskonauta was rated negative by kalu_bandali, Kel_, farkas and digitalcrickets
WHY?
I don't leave negative feedback because I don't think the same thing.
Regards