Slimline Tech
The "jewel" in GLR's inventory. It is a method of motor retention originally pioneered by Eric Haberman during the late '80's and early '90's, and modernized for use today. Being available in either Spirolox ring or threaded retention, it provides the smallest "frontage" for minimum diameter needs. Though most prefer the threaded versions, I choose the Spirolox style because you eliminate the risk of thread damage which might occur during a landing on a hard surface, ruining the retainer for futher use