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If its doing it in the last half of the song, its probably due to the trip mechanism of the changer being gummed up. The trip mechanism senses how fast the needle is moving across the record, and is designed to trip the change cycle when the needle enters the run-out grooves. This mechanism only comes into play toward the last part of the record. When was the changer serviced last? you car wouldn't run for 50 years without an oil change either, lubricants get hard and gummy after a few decades. You may still need a new needle, though, they don't last forever, and a worn one will not track as well and damage records. I like to have a spare on hand, helps to troubleshoot potential needle issues. If the new needle doesn't help, then I know its probably OK and to look elsewhere for the source of the trouble. Its pretty rare for a 1960's changer to work well enough to play a record if it hasn't been serviced in ages. I have dozens of them, not one works 100% unless I've cleaned and lubed it. good bet your motor mounts may need replacing, too. The Voice of music website has parts (and needles). Most of the Zenith Micro-touch changers were made by VM.
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