Hi all, I've been experience some leaking issues where the section joins the barrel of my Pelikan 100. Is the below steps correct to fix the problem? 1) Untwist the section and barrel with some heat (or is it friction fit) 2) Coat the section threads with sealant Which sealant do you think works better to make it airtight and leak proof? Rosin-based sealant, beeswax or the tar-based sealant on Penboard? Thank you, looking forward to your advice.