Reeder

So I got a new chain and I noticed almost immediately a knocking through the footpegs an thought I'd go home to see if I can spot what's wrong. Looked it over but saw nothing wrong. Today I took a closer inspection and stuck the bike on my paddock stand and found the stiffy! It looks like the one they connect the chain together with. I drowned it in lube and tried wriggling it a bit and then went for a ride. It was slightly better but still noticeable. Will this slowly easy off or have they cocked up the link? I got home and drowned it again in lube and oil and will try again tomorrow. Should I go back to the garage at the weekend if it's not right or should I wait a bit to see if it eases off?

Ta baaabbbes