Can you recommend a converter for Sheaffer Legacy?

[Avi R.]

I have an old plain black Sheaffer Legacy, all black with the gold clip and gold band around cap opening,
14K f Lifetime nib.
Problem is, it uses an unmarked squeeze converter that is a press-fit, that doesn't sit very cooperatively on the section,
and often gets caught in the barrel so that when I unscrew it the converter comes off of the section and has to be
encouraged to get out of the barrel. It also leaks enough to get the section tacky,
and this can be a problem when wearing nice clothes or handling important papers.

What's a good converter for use with this pen?

Can I do something to this converter to get it to fit more securely on the section?
(Assume I don't have any special tools or supplies.)

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