Hi guys my Christmas present 8R rebuild hit a bump today. I went to replace the SRV pip with a fettle box replacement but found it always leaked under pressure (Hot water method). I found that the pip being 4.5 mm diameter was moving in the hole which measured at 4.9 mm causing it to move forward of the seat. I remachined a new one with a 4.5 mm seat hole.works like a charm now. Regards Peter.