Hi all ,ive had the pump since last october and had very good results,but i have had to buy 2 new cylinders due to cracking,My problem being after inserting the cone and putting the ring onto the cylinder trying to get the cone off is a nightmare the only way is to pull it left and right to get it out ,maybe i need to try putting the lubrication around the cone, As when you do pull left and right there is a far greater chance to crack it. At the moment i have tried another way which i found works getting the ring and cylinder and lubricating them and just stretching the ring over the cylinder works fine no cracked cylinder. I was just wondering if the cone cannot be made with mind handles like the rings so you can pull it straight off without damaging the cylinder,There is not problem with the pump and accessories all are very well made and the only cracked cylinder was my own fault, Thank god nooglebury sell spare parts and all are quite cheap,Has anyone else had my problem ?.Dont forget anyone new to the pump remember if you have high blood pressure, the pump is far more safer than taking a chance on the many pills out there which your told not to take