Im a beginner to this, just got my first scope. I purchased some BST StarGuider eyepieces, and also a variable lunar filter (SVbony SV128). Thee issue is that they're both 1.25'' pieces, yet the filter doesnt quite catch the threads on the inside of the eyepiece. It sits flush but wont screw in and if you tip it, it just falls out. Right now im planning on just resting the filter over the eyepiece and hoping that will work for a while, but how can I solve this issue?

Any advice is appreciated 😄