Today I contacted Raymarine about availability of the shear pins used in the engage lever on ST4000 wheel pilot units. They no longer stock those parts but he told me they were 1.5 x 8 mm. I checked McMaster-Carr and they only go down to 2mm in stainless metric but they have 1/16"x 5/16" in stainless. If my math is correct that's 1.59 x 7.94mm so I'm going to order them. They only come in lots of 100 so if anyone wants some let me know and we'll work something out.