I had a similar faucet issue - with delta - and contaced them.
They have lifetime replacement parts. I didn't even pay for shipping.
Their site had great info too. From your link I found:
Leaks from aerator:
Replace seats and springs (#3 in diagram — Repair part RP4993).
If leak persists:
Replace Ball Assembly (#1 in diagram — Repair part RP70 as shown for lever handles or RP212 for knob handles)
I'd call them and ask for that part and away you go.
BTW I've repaired the bathroom faucet, shower, and kitchen. I didn't use any grease on anything, nor notice any when taking stuff apart.
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