I have this trem from GFS: http://http://www.guitarfetish.com/Wilkinson-Vintage-Tremolo-Pop-In-Arm-with-Block_p_897.html# Can't stand the pop-in arm and I want to replace it with a screw in one. Can this be accomplished by changing the block to a block that accommodates a screw in arm? Or would I have to replace the baseplate as well (in which case I'd just buy a new unit)? Also, does anyone know the string spacing on the model that I linked to? I remember it being something other than 2 7/32 but I'm not sure... Thanks.