99% likelihood that the drive heads are stuck to a rubber bumper. That old rubber turns into a gooey sticky melty mess as it tries to return to its original state. You may have encountered rubber feet in a similar state.
Send me a PM with an address, and I'll send you a SCSI2SD V5 at-cost.My SE I have reassembled (it was apart for a RAM upgrade); and gets thru to a flashing question mark disk icon. There is activity on the hard drive LED, so either something went bad on the drive (corrupted boot blocks, or System Folder damage?), the drive hardware is toast, or the SE's SCSI port is bad. My guess is that there's a bad sector in a critical spot on the drive - it's an original Apple 20MB SCSI drive, so it's not surprising that it could have issues after all these years. If I can't recover the machine with my FloppyEMU, then I'll have to order a SCSI2SD - something I've been meaning to do anyway; I just haven't actually done so.