AS mentioned in the Postman thread, I bought an OEM Lelit wooden handled pf that I wanted to simply unscrew the handle and replace. This photo shows the problem.
He just sent me this (he is Turkish)
You need the take of the metal screw on portafilter , thats not 1 piece , wooden handle screw deepness is not enough to install
By that I presume he means remove the bolt from the OEM and screw in the handle . My odd job man has taken it away, hopefully to sort it out!