I own two Parker Sonnets, bought them in an online auction together. I do not care for the nib and feed, they always start off dry, scratchy, and often skip. I was wondering if there were parts, doesn't have to be Parker, I could buy separately to swap out? I have no issues making these Frankenpens as long as they work how I like. I live in South America so shipping them to the US or Europe to get nib work done would be pretty costly and the postal system here isn't that reliable. Any suggestions would be great.