Steering knots?

[Meatball]

I drove the mrs 03 reg cooper s tonight.( It's covered 30k)
I noticed when turning the wheel every now and then there's what feels like little knots vibrating up from the steering rack.
Ive checked the ps fluid levels and it looks fine.
So could this be the ps pump playing up? I read somewhere there was issues with these.

Has anyone had similar problems?

[Meatball]

I wouldn't say it was a crack but the area its coming from could be nearer the wheel like you said

I'll give your idea a try thanks for your reply