I wished I payed more attention now but dad always did it with two syringes and that was it .... pushed with one ...pulled with the other and they were always spot on
I made my own kit with a couple of large syringes bought from fleabay, some flexi pipe, and a couple of canti adjuster barrels cut down. Proper bodger style but works a treat and only cost about a fiver
Also in true bodger style filling them up with WD40 works a treat too