Looking for a red Logitech Trackball ball with the black dots. My existing blue one has become jerky and is now useless with CAD when having to select entities. I completely dismantled it, cleaned everything, sanded any rough edges etc to no avail. It turns out there is a latent defect with the blue balls. I swapped it out with an old red one and it's 100% again. No red spares are available. Willing to pay for your dead red mouse 
Sent from my telephone.
Sent from my telephone.
