If you're having trouble finding a 7.2 MHz ceramic resonator (though see the comment under an earlier video), a wide range variable crystal oscillator can do the job.

This video describes the small modifications needed to make a wide range 'super VXO' for 7 MHz with a pulling range of over 50 kHz. The crystals needed - 7.122 & 7.159 MHz - are cheaply available as well. As with the first video you're encouraged to draw along for the circuit.

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