https://en.lacerta-optics.com/FTF3515-FSQ106
FTF3515-FSQ106 | Starlight Instruments Feather Touch 3 Lacerta Optics | Teleskop Mikroskop und...
Starlight Instruments Feather Touch 3.5" Focuser for FSQ-106ED
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https://www.starlightinstruments.com/product-category/end-caps/3-5-endcaps/
3.5" Endcaps Archives - Starlight Instruments
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https://haxon.es/gb/telescopios/2171-starlight-instruments-end-cap-35-female-thread-72x1mm-fits-takahashi-72mm-accessories-2001520007768.html
Starlight Instruments End Cap 3.5" Female Thread - 72x1mm (Fits Takahashi 72mm Accessories
Starlight Instruments End Cap 3.5" Female Thread - 72x1mm (Fits Takahashi 72mm Accessories