I don't think so
I have a CF500 (and love it) but I have a Hunter 23.5, not a H23 (which I've never seen up close). My CF500 just snapped on as advertised.I think if you have to raise your drum then you'd have to shorten the forestay and lengthen the tang. I don't see how else to do it.The bottom of the CF500 has a little bar that goes through the lower toggle, through the little space between the toggle's clevis pin and the "T" part of the T-bolt of the lower half of the turnbuckle. The tang, clevis pin and toggle keep the furler's fixed lower assembly from rotating. The clevis pin and toggle take the halyard load.Without modifying the forstay, the only higher place for this little bar would be through the centre of the turnbuckle, but surely that would be a huge mistake. Is it the anchor locker _door_ that causes the drum to need raising on a H23? I think I've seen posts here where people cut the front point off the door so it would clear the drum. They covered the resulting hole with something (perhaps the piece they cut off)....RickM...