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Cant get to a supplier and need a couple asap.. dont suppose anyone has a couple?
Don't know if it helps but Aldi were selling sets of o-rings last time I went in. Might find what you need?
As much as it shames me to say it, Halfords do a packet of assorted o rings for 99p on their bits rack. Has bailed me out twice!
Screwfix do a kit too. I thought it was waste of cash but the odd sizes have been really useful:
http://www.screwfix.com/p/o-rings-rubber-550-pieces/16982
Go a kit off some ebay shop v cheap too.
What's it to fit, exactly?
It's got to exactly that size and it's got to be n70 which is a specific hardness. Apparently. To fit a dhx shaft