This remix is an upgrade to the lever for Spring-loaded Replicator 1 Block (http://www.thingiverse.com/thing:252007). Included two versions one is just the upgrade lever and the other is the upgrade lever with adjustable tension for the spring. The upgraded lever is now a one piece as oppose of lever body and cover. The old design had issues with high temperature and repeated use. For the adjustable tension a M5 set screw is needed 12mm in length. To print use 20%fill and NO supports. NOTE: to see the failure on old lever design see last picture, top is a new part, bottom is a 6 month old part. NOTE2: After months of use, I had occasional and random skipping, I tracked it down to a 0.21mm difference on the bearing cavity; rev3p3 (fixed spring pin) and rev3p4 (adjustable spring pin) fix the issue. Bearing is a little harder to insert/install but the better fit prevents the bearing from slide out of alignment and cause the skipping issues.Use 30% fill and no supports, a ball bearing tab was added for print support purposes, remove it by pushing hard on the lever end of the tab and loose int it out by back-forth motions. Then clean the inner top of the cavity other wise the ball bearing will be hard to turn once installed. There not much to clean up as shown in the picture the small pieces of plastic is the only thing I had to clean up.