Cheap 10.111 MHz crystals: How far do they swing in a super VXO circuit?

Cheap 10.111 MHz crystals are sometimes available in bulk for a few cents each. They're handy for 10 MHz homebrew CW transmitters. How well do they work in a VXO circuit?
In this video I try two crystals in parallel. Series L and variable C allows stable coverage over the CW end of the band. The oscillator is even stable enough to key if desired.
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[@owenvinall9970]

Great video thanks Peter.

[@UndernetSystems]

Wow that's wonderful

[@MDFRESCUER]

Good video.

[@raafatalheety826]

Good vfo

[@IvanPassos]

👍

[@bluejay693]

Peter, do you think doubling up on the crystals again to 4 or even 8 would have an effect?

[@excx5cb]

73 Peter for QRP CW nice tone en CW . Luck de ex CX5CB CW FOREVER.

[@raafatalheety826]

Ruben Dario Montans Perez very good peter