Glen your certainly on the right track ,a lot of the Bristols in Australia have been converted to grease nipples over the years with great success. The problem with the one shot system is it has never been a great success because just like water or air under pressure it looks for the place of least resistance which means most of the oil leaks out of the most worn pin, therefore starving all the other lube points of their share of the oil.
I have recently converted my 403 to grease nipples but have retained the one shot for the rack . You will need grease nipples for the upper and lower pins, the king pins and the steering arms, that is, if I can add up, equals a total of 8 nipples.
You also need to remove the lines from the junction box that lead to the outer pins and block these off. From what I have learnt from other owners if your rack is in excellent condition grease may cause your rack to tighten
causing heavy steering. Best of luck , contact me of you need any advice
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