I used to own a 488RC2 BH...
And 488RC2 will shift a little, no matter how tight you had tighten.
Shooting macro is not easy especially your BH will shift or move.
That time I using 488RC2, I have to adjust abt 1mm to 2mm above my subject.
the reason why I do that is cos after I tighten it, my BH will move or shift downward.
So I wasn't happy with the this BH at all. ;(
After that I selling away and upgraded to Markins Q3.
my life have change while shooting Macro, is much easy and once is lock meaning is lock solid and no one can to shift or move it.
My advice will be... If you can wait, save a bit more get a light tripod and Good BH.
Getting a good stuffs is a long term investment and will last you very long.
I learn my lesson in a hard way.
I did a review for 190PROCX3 with Markins.
My Review version 1
My Review version 2 with additional photos.
Enjoy and have fun shooing with a good tripod and solid BH....
That is very important for me.......if you have to keep and adjust and shift and very stress and tired.