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I've never been successful in keeping a RORO system dust tight!
The clearances need to allow the roof the freely roll are always an issue.
Maybe those brush strips you now see on the mudguards of lorries (to wipe the mud from the tyres) could be used - they would close the gap and cause minimum friction??
On my smaller TSO (Tin Shed observatory) I made the side weather seal a bit longer than usual (almost 200mm) to increase the overlap with the walls and the ends ( when the roof is closed) seal onto rubber tubes front and back. Certainly keeps the weather out - but the dust...Hmmm
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