on 23/12/2009, geoff supposed :
The HSA really suffers from ****e microswitches

That might explain it.

easy to replace

You might think so, but I am struggling to get the replacement
microswitches to actually be switched by the cams. Other than possibly
rubbish switches, the HSA seems to be more robustly built than the
Sunvic.

The cam doesn't seem to protrude out towards the switches as far as it
should, which might explain the early demise of the original switches.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk