Personally speaking and it is only my opinion all kits are crap init?
How many times have we had issues with manufacturers and their quality?
How many times have they used inferior tubes that oval at the ends or have burrs or expand too much and split the blank?
How many times have the nib holes been blocked or wrong size stopping the refill from performing?
How often do you have to glue the finial in because the tube is too big?
It's easy to say check the kit before assembly but how much of it do you check, why should you have to?
Regardless of cost where is the "quality control" and "fit for purpose" in these kits that are sold to us.
Not only the jnr Gent but all kits.
No matter how good the supplier is and what issues they are prepared to correct, they can only sell what they are sold in the first instance.