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TBH I would never fanny around trying to repair a broken pump, buying spares etc etc. Who has the time for that? Time is better spent out cleaning windows and earning money.If you spend 3 hours trying to repair one, that's about 3 x £30per hour = £90 before you've even paid for any parts.Just spend the £130 and get a new one. Actually get 2, because IMO you should always have a spare pump on hand. It's one of the few things that can stop you working.
It's usually the diaphragms at the top that go .15 mins to fix .Mine just had some grit in and works as new after cleaning it out .They are not sealed units