Review on Hydraulic Brake Lever Master Cylinder Sight Lens 18mm - (Set of 2), Premium Replacement Kit with O-Rings by Precision Auto Products by Sean House

Does not fit 1985 Honda Fourtrax 250 master cylinder. I understand the installation process. The depth must have been wrong because when pushed, it completely crushed the master cylinder o-ring groove before the sight glass was even remotely level. The master brake cylinder is original. After I removed it and used the second glass, all I had to do was place the o-ring in the hole and press the glass against it and hope for the best. So far, so good.