Pilot Capless Fountain pen to Ballpoint converter

Since I have many fountain pens, I try to convert some of them into ballpoint so I can carry then on a plane. This model is made to fit an Pilot BRFN-30 Refill, and will be compatible to all Pilot Capless (Vanishing point) style fountain pen. 

If your print keeps falling during print due to unstable printer foundation, you can use the model that has extra support structure around it to make it stable.