Some other manufacturers cartridges may have a deeper body than Rega cartridges, these will sometimes require the use of the three-point spacer to allow clearance of the rear of the cartridge from the vinyl. When Rega arms are fitted to turntables from other manufacturers it may be necessary to add our Rega arm spacers to achieve the correct arm height. Note: On Rega turntables, spacers should not be necessary unless you are you using an exceptionally deep-bodied cartridge from another manufacturer. Arm height or V.T.A adjustment can be a controversial subject. Rega believes that the integrity of the arm fixing onto the arm mounting board is much more important than the questionable facility of arm adjustment. The arm should be reasonably parallel to the record surface or slightly lower at the mounting. The only time a spacer is necessary to raise the arm height is if the rear of a cartridge is hitting the record whilst playing.