Piper PA 22 tri pacer with spring landing gear?

[Romad275]

Found a project PA 22 with spring gear mains. Is that a type of tail wheel conversion? Estate sale and owner knew nothing. Log books were not available at the first look.

[FlyingRon]

Might be a Rupp Racer conversion. Check over on the https://www.shortwingpipers.org/ site.