Joined: Jul 2007
Posts: 524
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From: Fort Wayne, Indiana, USA
Bikes: riders:Schwinn Continental ('80), Specialized Crossroads Sport ('07), Schwinn Super Sport (73), Schwinn Superior (76), Projects: Schwinn Sprint ('74), Trek 800 & Schwinn Continental ('71)
If the middle number doesn't feel correct, try the combo # one higher, then one lower on that number.
It is possible for the internal tumbler to slip, not allowing proper alignment. The most it would slip by is maybe three digits. Usually the middle number, sometimes the last number. The middle number can be either plus or minus, the last number is usually plus.
Not experienced on portable padlocks before, only on safe doors, yet very similar internals.