Andy Dingley wrote:

unfortunately a fly press is all I have access to,

I'm sure you can find more. The force is low, you don't even need a
"press" as such.

Glad to hear that. They just look as though they ought to be tight...

They've often been done with screw-thread pullers or
even a big vice.

snip

Thanks again Andy.
I'll report back once I've had a fiddle.

Fly-presses work by storing momentuum in the whirling fly weights.

I understand. Whenever I've used one, I've managed to shift stuff
without swinging the weights around at speed, instead just using
leverage rather than momentum. This gives more control, but obviously
far less than something like a vice.
Come to think of it, I'm not even certain the weights were in place on
the last one I used. Perhaps technically that meant it wasn't a
fly-press at all.