Steveg58

@Shalaska
Ive just pulled out my one Lamy converter.
The converter in the photo does not look like a propriety Lamy converter, It looks like an International Standard converter. In which case that would account for leakage and poor performance.
Lamy. most of the Japanese, Shaeffer and a few other manufacturers use propriety cartridges and converters that are not interchangeable with other brands.
Some Chinese pen models claim to use Standard International cartridges but they are sufficiently out of dimension that only their own products will work.