Does mean that a #6 jowo nib will actually fit a conid? I thought jowo would not fit a bock housing.
Joao nibs do fit the housing. However, whether the nib functions properly is, in my experience, hit or miss. I've tried three different Jowo nibs in two different Conids and found that the Bock feed created too wide of a gap between the tines, leading to hard starts. Others have reported having had more successful experiences, however.