I bought a few Wing Sung 992 demonstrator FPs a few months ago and found out they all suffered from cracked-barrel syndroms ( See Photo 1) !! Functionally , these cracks do not cause any problems in writing at all but for collectors they are really eye sores which defame the good name of Jinhao brand ! Anyhow, I decided to change one of them into an EyeDropper pen and here is the way I did it :
1) Fill the barrel with water-proof GE Silicon Caulking ( transparent type, see Photo_02) about ¼ inch above the level of the crack .
2) To carry out this operation , I fill a ¼ inch. diamter drinking straw ( around 6 inches long) with GE Silicon Caulking up to about 3 inches in height (See Photo_03) . Then I insert this straw inside the pen barrel and transfer the caulking to the bottom with a 3/8 inch diameter wooden round stick (Photo_04) , making sure that the caulking is at least 1/4 inch above the crack . Care should be exercised to avoid any caulking sticking to the side of the barrel .
3) Let the caulking harden for at least 24 hours before filling with ink (see Photo_05) . Photo_06 shows a close-up of the Silicon caulking filled up to 1/4 inch above the crack .
4) I also used Silicon grease on the thread portion of the grip section to ensure that no ink leaking may occur at the section & barrel connection .
Edited by jobodine, 31 March 2018 - 00:22.