PROHELIX V3: 1 HOUR QUICK, EASY ASSEMBLY LIGHT & STRONG for Hornby, Peco R3/R4. Hornby 3rd radius curves R608 or R609. Code: HV3-D-505/572-4.5-500. Have You Seen Our HO Scale Engine House. Proses helices can be assembled and disassembled with ease in just a few hours.