Webley Alecto Valve O Ring

[Vic Thompson]

My Alecto obviously doesn't like being left around lying idle for months, as when I tried using it today for the first time in ages the Valve Seal "pops" at the end of the Cocking Stroke.

I haven't got a spare one (part no 3010 on the Bagnall and Kirkwood Web Site diagram) knocking about and just need something to get it going again as it's not worth a full stripdown and service as I won't be using it again for months. So my question is : does anyone know the Valve Head O Ring size for an Alecto so's I can order a generic part off EB ?

Thanks, Vic Thompson.