Did you get the converter for the Lamh Safari? I actually use the same for cost reasons (and I like the grip) but I use the disposable cartridges, which seems wasteful. I have just heard that the Safari converter is pretty quick to run empty?
If I ever use a disposable cartridge again I'll try reusing it instead.
Do use luer-lock though, because the other kind of syringes suck. Just ask your local pharmacy -- they usually carry them and they can be used for all sorts of non-illicit-drug reasons.
In the US/Canada Lee Valley sells a set of blunt tip syringes for inks and glues.