How to fit a Morse #1 into a Morse #3

Overdo it with a No. 3 Morse taper sleeve. Morse taper #1 standard size taper ratio 1:20.047, large head diameter 12.2 mm, small head diameter 9 mm. Fitting into a Morse No. 3 can be overdone with a No. 3 Morse taper sleeve. The Morse taper is an international standard for tapers and is used for static fits for precise positioning.