They are not that difficult to tackle with the exception of carefully re-crimping the socket ball. Most just need a good internal cleaning and free up the pinion spring & brass plunger. Rick has the good bellows from the UK.Wanting to get my rack rebuilt. Tried email to tigerengineering.net (TomHall) but no response. Does anyone have a phone # or other email to try? Is there someone else you can recommend?