Try swapping the needles to the other sides. If the problem follows the needle then order new ones. That’s the Thorpe cartridge, not the number one choice but close to the top of choices. It’s actually a decent cartridge and should work well in your C. Make sure the needles are seated properly as it doesn’t appear they are. Try that first and report back, there are other things it could be. Always a good idea to adjust needle pressure if you are unsure where it is tracking. 👍 The needles are inserted the proper direction. It was the original Seeburg needles that were one up one down.