https://www.modelfixings.co.uk/

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Quote from their website:

We offer a range of replacement engine bearings, helicopter bearings, servo bearings, cyano and epoxy adhesives, assembly adhesives, ties and clamps plus a huge range of screw fixings (including servo screws) at very competitive prices. We also stock a large range of taps dies and drill bits, O rings, Circlips and E clips