Very frequently lost when the disk drive for the Spectrum +3 is opened for servicing - a tiny but crucial part of the drive - it won't save programs without it !
This pin is required in the original EME-156 drives fitted as standard in the Spectrum +3.
It is possible that your drive may have been changed over time for a different drive model number (most often an EME-155) - if so, this pin is not required in that model.
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