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What are the 2 eyepieces you are referring to? I assume they are 1.25" eyepieces
Most 1.25" eyepieces use the industry standard 1.125" x 42 tpi right along the eyepiece barrel. Which means you can unscrew the barrel turn it upside down and screw it back on the other way round. Depending on the positioning of the undercut relative to the end of the barrel, this might even solve your problem. If it doesn't you should be able to source any old 1.125" x 42 tpi barrel (without undercut) off another eye piece and screw it straight on.
1.125" x 42 tpi is the standard thread size for 1.25" filters / eyepieces. A few eyepieces, notably Brandons/Questar use something different. FWIW the standard 2" eyepiece / filter thread size is 48mm x .75mm pitch.
Cheers
John B
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