so a spacer would be 29mm ID?
ebay sellers have either 28mm ID or 30mm: https://www.ebay.co.uk/itm/333609764631?hash=item4dacb10717:g:NdoAAOSwcuBgAd4Q
No I think that would be a bit loose. I don't think there's likely to be a not for purpose tube that will be exactly right
@PhilDAS started
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so a spacer would be 29mm ID?
ebay sellers have either 28mm ID or 30mm: https://www.ebay.co.uk/itm/333609764631?hash=item4dacb10717:g:NdoAAOSwcuBgAd4Q