tnx Grimberg 
first thing - be sane enough to remember to order some, when ordering parts
second thing - order few more, so you can cut them in adequate length, for squeeze work
third thing - be careful when working with them, if you loose them on the floor, chair is having 6 double wheels, each of them being equally ruthless; so order even few more
because of third thing ( done first few more than few times), I'm always in need to do it again
me being even more clumsy, with age

first thing - be sane enough to remember to order some, when ordering parts
second thing - order few more, so you can cut them in adequate length, for squeeze work
third thing - be careful when working with them, if you loose them on the floor, chair is having 6 double wheels, each of them being equally ruthless; so order even few more
because of third thing ( done first few more than few times), I'm always in need to do it again
me being even more clumsy, with age
