Good idea fitting an extra oil filter. I have one off of a Norton Commando and lots of the filters. The tank has been cleaned, new oil lines fitted and a new strainer for the oil tank installed. Finding straight ND oil is difficult here in Texas.
The oil line to the rocker box needed to be repaired. Somewhere in its abused past the line had broken and a hose was stuffed onto the banjo. Drilled out the remains of the tube and sweat soldered a nipple into it.
Thanks to you all for you input.
Cheers
John in Texas