We typically do not provide repairs or replacements on overused charging tips and direct customers to purchase extra tips at: http://chargetech.com/product/charging-station-replacement-cables/.
If your unit is being utilized in a public place with high traffic, we recommend purchasing additional Charging Station Replacement Cables to have on hand.
Please note that our One (1) Year Limited Warranty on products only covers the charging station with manufacture defects. Concerns of manufacture defect must be reported within one (1) year of order shipment. You can read more about our warranty policy here http://chargetech.com/faq.