understood that seat 223 does not have to include a collar portion but may be a washer like flat member moreover while outer ridge portion 232 is shown as being circular in shape and positioned generally concentric with the lifter body axis it is understood that ridge portion 232 can be eccentric with the lifter body axis or rather than being circular in shape can take the shape of one or more tabs proximate flats 214 a 214 b extending beyond lifter body 214 finally while the present invention is shown as part of a deactivation lifter assembly having a spring tower and an external lost motion spring it is contemplated that ridge portion 232 could be used in conjunction with a deactivation lifter having an internal lost motion spring or in conjunction with a standard non deactivation lifter it should be particularly noted that using outer ridge portion 232 to retain drhvl 200 within anti rotation guide 250 substantially reduces friction between lifter body 214 and anti rotation guide 250 relative to conventional methods of retaining lifters within anti rotation guides prior art lifters are retained within anti rotation guides by a substantial interference or frictional fit between the lifter.