shoeless
Riffin'
This popped up as an ad for me the other day. It's a pretty ingenious design, IMO. It requires no modifications and appears to put the springs in the string ferrule holes. No extra drilling like a Bigsby would need, no routing of a cavity for springs like a strat, clever.
https://vegatrem.com/vt2-teletrem-telecaster-tremolo/
https://vegatrem.com/vt2-teletrem-telecaster-tremolo/