R  &  XP  Machine Ballscrew Couplings
In Early 1980's,  Strippit Solved a Persistent Machine Problem with Keyed-Ballscrew Couplings by Upgrading to New Keyless-Couplings which did Not get Sloppy Loose Keys,  and Fall-Apart.
In 1990,  Strippit Introduced the  R & XP Machines.   To make Machines Cheaper,  Strippit  Stupidly went Backwards to Old Keyed-Couplings again,   and  "Duh!",   Same Old Problems came Back.
If you have  Loose,  Broken,  Falling-Apart  Ballscrew Couplings  causing Tolerance Problems  or Worse,   Replace it with  Our  Keyless-Coupling,  which has  2  Advantages;
1  --  It has a Higher Tork-Rating  than  Original Coupling,  making it  Much more Durable.
2  --  It Clamps onto Motor & Ballscrew Shafts,  even if Shafts are  "Less than Perfect"  
         from Damage caused by Old Coupling.   
         Just Clean-Up any  Burrs & Rough-Spots  on Shafts with a Flat-File,  Slide Coupling On Shafts,
         Center Coupling Between Shafts,  and  Tighten Lock-Collars at each end.   
          No More Keys to Fit & Install.     No more Keys to Rock Back & Forth and get Loose.
There are Many Misprint-Mistakes in Strippit's Part Manuals.   In  1  "R-Machine"  Parts Manual,  this Same  X & Y Axis Ballscrew Coupling is Listed as   #120823-000,   #120832-000,  and   #120382-000 !
To make Sure you get Correct Coupling,   Measure  Both  Your  Motor  &  Ballscrew Shafts.   
Most of these Machines have   .750"  Motor-Shaft    and   .718"  Ballscrew-Shaft   Diameters,  
and that is the Coupling we Stock,  though we can Make any Coupling you might want.
Below Photo,     New  Keyless-Coupling  on Left,    Old  Keyed-Coupling  on Right.