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Glad the problem is solved.
You got a pretty decent scope for $25.
I was a calibration specialist in the Army (MOS 35H) for 20 years-calibrated hundreds of scopes.
Hopefully you got probes as close to the input impedance and bandwidth of your vertical amplifiers as possible.
It helps to "stretch out" the leading edge of the square wave as much as possible using the V/div. and time-base controls when adjusting. You'll then see small irregularities in the waveform-just try to smooth out all the ripples as flat as possible-you'll never get it perfect.
There are adjustments inside for both the calibration signal AND in both vertical amplifiers for squarewave response-you'd likely need the service manual, or know an experienced tech. to help you adjust it.
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