Dear Khun Lee,Following our internal installation work of C-81105, we found the problem with the deck seat of all odd no. #3 through #15 are the wrong dimension (detail as the attachment) and the deck seats are welding with the shell of the column, so we can not install the internal part of C-81105. Anywhere, we are waiting for your resolve the problem and our team are stan-by for 10 persons. (detail as the attachment)If you need more information, please let us know.Best regards,Sorod Ch.087-908-0882Protechfield Co., Ltd.