[G6Tanuki]

The Oxley "Tempa-trimmer" being a thing of the past, you can achieve the same adjustable-temperature-coefficient effect by using a small differential-capacitor and one negative and one positive temperature-coefficient capacitor (both identical actual value).

Must admit, these days I generally avoid free-running VFOs unless they're coerced into stability by something like a 'Huff&Puff' sample-and-hold circuit.