The 'oil seal' originally fitted predated the introduction of modern lipped seals and (especially when old) they are far less effective than a modern equivalent...

These are readily available and would be the best choice as an upgrade to replace the original type...Ian

email (option): ian@wright52.plus.com

I have found and ordered a modern seal.The seal supplied is as hard as bakelite. So thanks for the advice chaps.
Haddy

email (option): mhadfield35@yahoo.com.au