HI Salar,
Instead of C8 and C9 put a single capacitor ( 2pF or more) for 1-6 V at point X with about 3 Mhz as vco frquency, BC237 is OK. The quartz lrl works well in my test field and is more easy to build and every quartz in 3 -10 mhz range is OK.
Regards
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