Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2939089.

you insert tube through oval into clamping are then close clamp to secure. use supports . even area between top clamp and bottom part in the clamping area. careful separating all the supports. u should hold the end of the locking area with one hand/thumb, and pry under the top clomp to pry up the top clamp . after that u may need to sand the area at the ens of the clamping area of the clamping ends. after that your golden