About this 3D model

I use my Vision 1 to listen to going to work. Normally I pop it into a pocket, feed the lead under my shirt and plug the earphones into my ears. Then as I walk, my swinging arms catch the lead and pull the 'phones out of my ears. So I designed a simple holder that will hold the Vision, take up the slack and clip it onto my belt. The latter is useful as it keeps access to the player and reduces the stuff I end up putting in my pockets! The opening for the player is a little on the long side, but suits what i need. Have included the Sketchup file if anyone wants to reduce the height (could probably do with a 2mm reduction).