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.