Those Remo conga heads do not make replacing
heads easy. This video may help you understand
Remo's method. Looks like that D4 at the end
of the model number is for congas with extended
hoops only. If your conga does not have extended
hoops that may be why the hoop does not fit. You
may need to choose one of the models that end
with D1, D2 or D3. But any way this video sheds
some light on how to choose the right Remo head.
Good Luck.
https://www.youtube.com/watch?v=1CSMDs7 ... CXK04kikd1