To play carp correctly, with large diameter elastics over size 10, or Hollo, you need to cut your pole tip back (sometimes quite a lot) or remove the number 1 section completely. Whichever you choose to do you must make sure the tip doesn't bend too much. If it does the elastic will stick to the inside of the top section and not work properly.
How far you cut back the tip may determine which type of bush you can fit. If you cut it back a long way to make it ultra stiff, the internal diameter of the tip may be too large to fit a standard internal bush. In this case use an XLarge Internal Bush or a Slip Stretch external bush.
Many top anglers remove the number one section and fit an internal or external Stretch Slip Bush straight onto their number 2 section. This produces an ultra stiff tip and guarantees smooth elastic performance.