At your risk.
3 seconds of neglect can cause hours of delay.
When the tape is new one has to remove the light blue end sticker that holds the beginning of tape in place.
The glue behind this sticker can decorate over all those years. At a sufficient high ambient summertime temperature the glue will be left to the adjacent back coating of the next turn of tape.
If then the tape is loaded to a reel to reel tape recorder, the glue will be left to the pitch roller.
Then for every revolution of the pitch roller the tape will catch and this will be a curse of erratic motion. It can be so dramatic as to even affect the smooth operations of the take up spool.
It may take hours to remove this glue from the pitch roller and capstan.
Remedy.
For example making sure the back coating is clean. If not cleaning it with isopropyl alcohol?
Perhaps it may be even better to remove the contaminated segment of tape.
The Uher 4200 report which was contaminated by the glue was cleaned:
With isopropyl alcohol for the capstan and rose water for the pitch roller.
But the glue is so sticky that isopropyl alcohol had to be used for the pitch roller too. But then the isopropyl alcohol may start melting the rubber if left for more than a few seconds. It is very tricky.
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