It's great that Signature Tips have spare parts available on the site for the Clutch mod as some parts do tend to wear out over time. Just wished they also included a spare hybrid 510 as well because the threading does wear out over time also! Orderd a Sled+Silver Contact Bar for one of my Clutch mods and now it's alive now and performing like it was brand new! Will be ordering more Brass Plates and Silver Contact Bars to keep around. Also the shipping time to my address is the States was very impressive! Other than not having a spare hybrid 510 available to order I'm completely satisfied!