Flying foil-caps

[Disco Volante]

A good number of the vintage amps I work on have their foil caps carefully mounted about 5mm above the PCB with little insulating sleeves.
Is this a way to control any stray capacitances running around? Or is there some other good reason to do this?
It seems a lot of effort/money if you're hand assembling a thousand or more amps...

Jus' wonderin' 's'all...
Here's a small example, RIAA board from a B&o Beomaster 1600.

 

[Brian Roth]

Those polystyrene caps melt quite easily when soldered. My hunch is that they are installed that way so the wire leads act as sort of a heat sink.

Bri