Adapter was custom made and internally flocked used to lengthen the drawtube I do believe it came with my scope when I bought it and as I will never get in to imaging I have no use for it
Just make me an offer if interested
TKP36001 coupling adapter M91x1mm
TKP30003 coupling adapter M92 male to M72 female
These are connections for both ends the same as connecting a 2'' accessory to the FSQ drawtube