Hey guys I have 6 sets of the new revision 2 optics, I have the sale price of $6.00 a set shipping in the conus US if you need. I will not have anymore at this price once they are gone. Happ # S822-SD DUAL CHANNEL SLOTTED OPTICAL SWITCH "NEW REVISION"
These sell for $10.50 each at happ. These just released 3 weeks ago & are a upgrade for all previous optics...you will have to remove the old chip & solder these in place but its pretty easy. The new optics make the trackballs very responsive, I changed mine out
Send me a pm if you need.
dm