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If you elect to replace the double row bearing in the front hub with a wider (and easy to find off the shelf anywhere) double sealed 2RS bearing that does need the centre/center spacer tube machining to suit the new bearing width.(A standard width sealed bearing was not available in Australia and refused to use bearings made in you know where)The one single row bearing (front) and two in the rear hub are straight forward replacements as a sealed 2RS item.https://www.oldbritts.com/wheel_upgrade.htmlYou will find plenty of reading on Old Britts as above.
If you elect to replace the double row bearing in the front hub with a wider (and easy to find off the shelf anywhere) double sealed 2RS bearing that does need the centre/center spacer tube machining to suit the new bearing width.
(A standard width sealed bearing was not available in Australia and refused to use bearings made in you know where)
The one single row bearing (front) and two in the rear hub are straight forward replacements as a sealed 2RS item.
https://www.oldbritts.com/wheel_upgrade.html
You will find plenty of reading on Old Britts as above.