Confirmed that the 1up trolleys will **not** clear GRK RSS screws even without washers. The threaded hook end retracts into the trolley body (and can be adjusted), so I'm fairly certain it would clear a lower profile screw if necessary. For my installation I needed to use trolley hanger brackets to clear ceiling tiles anyways so it didn't matter.
March 4, 2024, 10:16 a.m. - brewtus
Confirmed that the 1up trolleys will **not** clear GRK RSS screws even without washers. The threaded hook end retracts into the trolley body (and can be adjusted), so I'm fairly certain it would clear a lower profile screw if necessary. For my installation I needed to use trolley hanger brackets to clear ceiling tiles anyways so it didn't matter.