It'll be far easier if you loosen every spoke on the wheel, then completely detach the 'heads-in' spokes one by one and cross under for the third cross. This will be easier with a looser wheel, and retensioning should be a bit easier, when starting with all the spokes loose.
This wont take long as the shape of the wheel is'nt going to change.
Good work Hugo. Repped.
My 2p. Follow Hugos advice, basically.
It'll be far easier if you loosen every spoke on the wheel, then completely detach the 'heads-in' spokes one by one and cross under for the third cross. This will be easier with a looser wheel, and retensioning should be a bit easier, when starting with all the spokes loose.
This wont take long as the shape of the wheel is'nt going to change.