they are southgate with normal flat v springs - these back into a receiving radius that has separate tensioning setscrews, if i understand what i'm looking at, they might have capacity for slight adjustments for tuning the kickers (?).

my luck would never support the sort of chances that coil springs might offer. pretty much expected the responses....thanks to all.

"it's a poor sort of memory that only works backwards."
lewis carroll, Alice in Wonderland