Dumb Question Of The Day
Is because, You haven't seen yet what can go wrong with a common retainer, used in an abusive environment. Spirolox won't break or fall out, a regular offering can cause a worn slot/trough gouge in the cylinder wall when it fails. Correct orientation of the end gap of a common retainer can prove to be verry beneficial. Never put the end gap of a regular clip at or near the 3 'o'clock or 9 o'clock placement. Centripetal force factors come in to play. They will fatigue if so. 340's (high revers) and 390 fords (turds) are usual culprits of this type of failure. Pics include the 1 type that can fail/ break and the type that can fall out, (pic to follow when I find it).