4 73 Servicing of American Lock padlocks and cylinders made easy using this handy service kit. Pin Tumbler Service Kit PK1 - Maximum+, Twin Maximum, C4 Cliq, Twin Exclusive, Twin V-10, Twin Pro Full Size Standard Pin Kit Pin Kit includes 100 pieces of each size bottom, master and driver pins, 500 tumbler springs, 50 sidepins, 100 each sidepin and sidebar springs, 100 Phillips cam screws, and 25 mortise/rim cover strips. Keying Kits JV# MFG# Description 325-900 ASK8 Pin Tumbler Kit JV# MFG# Description 325-975 PK-1 Pin Kit 4. Keying Kits & Pins