What the hell is an acceptable compression spring to use for Farfalla flippers? The only ones I have keep sliding over the edge of the flipper linkage, wrapping around the backside, and not letting the flipper return. It's been pissing me off for months, I've asked several times for CONRETE INFORMATION like part numbers, and as of yet, nobody has been arsed to share this info. Some *actual info* would me MUCH APPRECIATED.