you have to do two things
1-get some Sand paper (gadat Sai) and when conveyor running hold paerr for few minutes to cut the surface to clean it and make it rougher
2-Rub sharp corners of the guides with sand paper then after Put teflon on the inside of guides and around top and bottom
take bottle by hand and slide all the way along the guides and check if the bottle is free all the way about 1mm gap not less not more