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You require a 4mm diameter x 12mm long dowel pin either stainless steel or silver steel.Plenty available on flea bay and a traditional hardware shop may have a selection. Some engineering companies may have them and people like Cromwell tools certainly will.You'll be ok in the short term trippy, but buy a pack of 20+ for a couple of quid so you have sparesDarran
Any DIY shop - silicone grease, comes in a tube or tubDarran