In my experience, spares for tape cartridges are impossible to obtain, other than by dismantling a new cartridge. This is worth doing if you have a defective catridge with some important data on it. Argh! (that's me remembering what happens when you try to do this). The belt runs from the 'drive puck' (the roller that's driven by the capstan in the drive), between the 2 tape spools (it rubs on the outer layer of tape on both spools, thus maintaining the tape tension, and causing the tape to move at constant speed), and then round one or two idlers. The better cartridges have a fixed idler (on a post fixed to the baseplate) in the bottom corners. Some lesser cartridges have a 'floating' idler between the 2 spools at the bottom. That sort is a right pain to rebuild, and some of them were glued together (particularly on the smaller tapes), and these will drive you mad! OK, assuming 2 fixed idlers and screwed-together housing. It's best if you have 2 new tapes - one to take to bits for spares, the other to show you where all the bits go. Start by undoing the screws on the bottom of the cartridge, and pull off the cover. Remove the door and its spring. Take off the empty-ish spool (unwind the few turns of tape if necessary), the idlers, drive puck and belt. Take off the full spool, making sure you don't spill tape everywhere. Clean up the rollers and housing. Now to reassemble. Put the full spool on the 'supply' side. Put the drive puck, idlers and belt in position. The belt will be fairly taught even now, and should stay in place Drop the empty spool over the other spindle. It won't drop down as the belt gets in the way. Using a cocktail stick/plastic spike/etc, hook the belt round the spool. Evertything will fly off (:-(). Try again, and after about 5 goes you'll get it in place. Run the tape round the guides and put the end in the gap between the belt and the empty spool. Hold everything in place and carefully turn the drive puck. Keep on guiding the tape until 2 or 3 turns are wound on. Counter-rotate the 2 spools to tension the tape. You will have to force them against the friction of the belt. Refit the door and spring. Often you can fit the spring into a hole on the bottom of the door, tension it, and hook the end into a slot on the door. Then drop the assembly onto its post, and finally release the spring. Put the cover one, and fit the screws. Wind on the tape a few more turns, and try it in the drive. Start by 'retensioning' the tape. -tony Wayne ! ! ! ! ! ! ! ! ! !