Good morning,
Just getting my crossfire pro assembled and I’m having issues with 1 coupler that won’t tighten on the lead screw and motor. Can anyone share their experience? Langmuir is supposed to mail a new one but it’s been 7 days with no update on tracking.
If you want to get it going save your self some trouble and order some good ones. If you do a search for couplings on the forum you can find recommendations.
I stripped one of mine so I made one to get me through a project then just ordered better couplings. These are bad to slip anyway.
Ruland CLX-4-4-F One-Piece Clamping Rigid Coupling, Black Oxide Steel, 1/4" Bore A Diameter, 1/4" Bore B Diameter, 5/8" OD, 1" Length https://a.co/d/dLAm1my
These are commonly recommended as quality replacements.
Rutland Coupler CLX-4-4-F - Ruland CLX-4-4-F, 1/4" x 1/4" Rigid Coupling, Steel | Ruland
I have to get off this forum. I keep buying stuff. Just bought three of those couplers!!!
The #4-40 hex heads strip easily. Try replacing them with #4-40 Torx-Plus. Not Torx, Torx-Plus. They have a higher torque rating. McMaster 92610A106. Use tool 5259A15 also from McMaster.
@carl Get with Langmuir through an email. They have a version of the Rutland coupler for less than $8. If it’s a new machine, they will replace it.
I have not seen or heard if this version is black oxide-coated steel or aluminum. If they are aluminum, I would order the Rutland couplers listed above in this thread. The steel coupler will tighten, and you will never touch it again.
Again, $8 is much cheaper than $30 if they are made of steel. Just my opinion, as usual. 
March of 23 was the last post before @carl
