Used two gallons of gas to go get a $0.13 o-ring in Eureka. Lovely. Then no instructions or photo of the pushrod covers. Fixed that with a visit to the Zippers' website. For each pushrod tube, there is a chrome collar that slides on an aluminum tube. One of the chrome collars has no clearance and the tube can't be moved. Forcing the collar just gouges up aluminum and is making it harder to remove. No success yet. Certainly a lack of quality control on this piece.