opening 27 this requires pushing the pin end 48 against the end ramps 41 of the retainer hooks 40 which causes the head ends 38 of the stringers to cam inwardly so that the hooks 40 can pass within the bore 47 of the piston pin 14 the pin 14 is then slid over the stringers and into the extended bore 22 27 of the piston and connecting rod until one pin end 48 engages the radial arms 42 at the base end of the retainer clip 15 at this point the hooks 40 extend beyond the other end 48 of the pin 14 so that the stringer ends 38 spring outward and the hooks 40 engage the other end 48 of the pin locking it in its centered position in the piston bore 22 and retaining the piston connecting rod assembly 10 together the assembly 10 is then complete as shown in fig1 and 2 installation of the piston pin 14 also prevents the fingers 43 from being flexed inward and so positively maintains the hooks 44 engaged with the faces 32 and prevents the retainer clip from disengaging from the piston as long as the pin 14 is installed when it is desired to.