Show G PISTON I Of i RE pu P I How Sow to Bore Leather and andI I Fit It Properly for Use The leather which forms torms the pis- pis piston piston pis piston ton of ot a tire pump I Is rather difficult difficult cult to form torm without some som some sort or of fixture for tor the purpose The leath leath- leather leather leath-I leath er used foi fot most roost pumps is Ls 32 about 32 3 of an Inch thick and can canI I readily be formed by means of ot a hard hardwood block which I is drilled I Ito to sire of the pump cylinder and to the diameter ne ne- ne ne-ce ne ce ce sar sar to form Corm the piston Tills This should be cen- cen centered centered cen centered with Ute the hole and a a plug Is then turned to a diameter about sixteenths three sixteenths Inch smaller than the hole in Ln the botch boick For most all cases the leather and the count count- will have to be bo about three three- three quarters quarters of an Inch larger than the diameter of the pump cylinder C the form form- forming forming I and In order ordel to simplify ing of the the she piston the leather should be trimmed to a feather Ceather edge sole leather males makes the best piston and should be soaked ked in water ateI until very er soft then lay Into tl tiro o counter bore counter counter- bore so as to it center finally witha with a heavy Y hammer drive drLe e the plug Into position position Allow the leather ther and pug pue to remain in the fixture for several se ral hours hour piercing the hole bole In the center after atler It Is remo ell Automobile Digest t |