Thought I'd let everyone know I removed the old ptex filling by using the edge of my plexy glass scraper and fine tuning with a razor. Though at the part where the white core was showing the scraper actually scrapped away some of that.
Nice. That should be alright that you scraped some of the core, as long as you didn't take a huge chunk out. Also are you using something like metalgrip to bond it to the base? If not, I would use that at the core then go over that with the ptex candle.