ERF filter sleeve

Lunt Solar Systems ERF Energy Rejection Filter) sleeve for refractor SkyWatcher Evostar ED 80/600. Contains two parts: filter sleeve and cover. It must be screwed together with four 10 mm long M3 bolts with conical head. Inner diameter of filter sleeve is bigger than objective diameter to fill the gap with some soft material like black self adhesive velour.

Link for ERF filter: https://tavcso.hu/en/product/LS75ERF

Link for telescope: https://www.astroshop.eu/telescopes/skywatcher-apochromatic-refractor-ap-80-600-evostar-ed-ota/p,15056

Link for self adhesive velour: https://www.astroshop.eu/straylight-and-glare-shields/astoptics-self-adhesive-velour-48x50cm/p,57841