Check the listing for details. Quantum ProDrive ELS Repair Insert - Fix your classic Macintosh hard drive!. Listed at 16.99 USD. This ABS plastic insert corrects the stuck head problem common on Quantum hard drives used in old Macintosh computers from the 80's and 90's. On boot, an affected drive will spin up and down a few times, then stop without any seeking noise. Simple and quick installation in minutesNo need to disassemble drive internalsWill not interfere with the head parking functionPrevents the head from making contact with decomposing rubber bumpersReliable and permanent fix Installation instructions: Find a clean place to work with minimal dust and airflow. Position the drive with the top cover facing up and the interface and power connectors pointed away from you. Remove the six top cover screwsCarefully break the seal and slide the cover forward about one inch. Take care to keep the disk's platter covered. Pivot the insert into place, right side first as shown in the image.Seat the left side of the insert into place.Use the same screwdriver to firmly press down on the index hole on the insert. You will encounter some resistance.Reinstall the drive's top cover.