Python Refill Spool

About This is a universal reusable spool for refills that screw together and center the refill core, using thin flexible tabs. They're used for centering but not to fully hold the spool so make sure you screw the two spool halves tightly to ensure it doesn't rotate. Check the Spring It's a good idea to check the spring every now and then to ensure it's still flexible. Printed springs under compression for a longer period can lose its original properties (i.e. not flex back). If n