The U.S. aircraft register, updated daily
Parts

Lens Fastener

No failure report names the lens fastener. 1 FAA approvals let 1 company make a replacement lens fastener, Wasp Company holding the most (1).

Approved replacement parts 1 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a lens fastener and sell it as an approved part for the models named. These are the companies holding such approvals for a lens fastener:

For these models most: Cessna A185 Skywagon (1), Cessna 305 (1), Cessna 206 Stationair (1), Cessna 185 Skywagon (1), Cessna 180 Skywagon (1), Cessna 172 Skyhawk (1), Cessna 170 (1).

MakerPartReplacesFitsGrantedStatus
Wasp CompanyLens Fastener 4000-33Modification PartCessna 185, 185A, 185B1994-09-30current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.