I have not scaled this but about there should be right;
1.6kg Shoulder skin on
0.8kg Belly skin on
Cut off skin and boil in water till tender. Mince on finest setting and add to mix.
2.5 tsp sea salt crushed
2.5 tsp black pepper
3 tsp dried sage
1 tsp grated nutmeg
0.5 tsp mace
1 tsp oregano
200ml cold water
squirt tom puree
0.5 tsp celary salt
4oz fresh white breadcrumbs
Mince the belly on medium
Mince the shoulder on large
Then mince all together on medium for a final time to get a mixed texture.