Eyepiece Help (1 Viewer)

I've just bought a Optisan scope of the Bay for £15 It's a generic scope made for an infamous Jap company by Chinas leading lens maker. Other names use the same scope. Centon, Tasco, Viking. With the zoom eyepiece the scope is nearly on par with the old Optricron, Spacemaster ect. With a decent fixed mag eyepiece the viewing would be greatly increased. :t:

Questing is, from the pics of the eyepiece fitting, can anyone recomend any other eyepieces that would fit

Thanks