I purchased some replacement posts as my cats have scratched through the sisal and cardboard. Usually I replace the sisal rope but unfortunately I had left it too long and the cardboard posts had been scratched right through. Measured the height I required (I actually went a little bit higher to give my cats' a bit more vertical scratch space) ordered, items came through quickly :) Used a hexagonal key (allen key) to remove old posts and fitted new ones, job done in under 5 mins. Took longer to find the hex key and order the replacement posts :)
I also took the opportunity to replace the base covering (new mat runner and some carpet tape).
Scratching tower is back to looking very smart, and fully functional for several years to come. Cost effective solution, to keep your cats' posts and towers in tip top condition.
I am thinking of making some bespoke steps using the different heights sizes to enable my almost 20yr old tomcat access the radiator bed.
This is also a very cost effective way of increasing height to towers / between platforms when kittens have outgrown their tower, or as larger breed cats grow (like maine coons & ragdolls) or splitting a large tower into several with more height between platforms, if say you moved or deceided to have a change about. (I have recommended this to some of my clients).