[Healeys] Carb cap

[Simon Lachlan]

Hi,

A Healey question this time.

One of the three black plastic caps on my tricarb(!) keeps coming unscrewed.
That carb seems to be set right/same as the other two.... ie its mixture is
set per the book and it sounds the same through a length of hose as the
others. The car runs well, touch wood, with no unseemly banging and fizzing
from exhaust or intakes. No running on etcetc.

The carbs are HD6s, not HS4s, and they've been quite recently completely
refurbished.

What's going on?

Thanks,

Simon