Hi Lynn,
You make a good point. I am no expert on these so am only repeating what the engineer who is assembling the pumps has told me. However your theory does make sense in that so long as the spring has sufficient pressure to keep both ends of the rubber bellows sealed against the carbon disc at one end and the impeller at the other it should be OK, or at least as good as these ever were.
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Mike Gurr
1944 Matchless G3L
1944 No2 MK2* UC
10 CWT GS trailer
1944 BSA M20
Royal Enfield RE125 'Flying Flea'
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