TC102, TCP102, TCR102, TCX102, TC122, TCR122, TCP122, TCX122. Photo 2 shows where the pinion is fitted. Fits on differential for tightening the chain. Fits models from 1996 onwards. Fitted to the following, but will fit models we have missed.
Chain Tightening Tensioner Pinion Fits Honda HF2213 HF2218 Mowers CG25570001H0
Chain Tensioner Screw - Guide Plate Adjusting Bolts Kit, Precision Chain Tightening Hardware Replacement, Metal Adjustment Component for Lawn Mower Chainsaw Maintenance Backyard Farm Use
Chain Adjuster Tensioner Screw - Metal | Chain Adjuster Bolts,Çhain Adjusting Bolts Replacement,Chainsaw Tensioner Replacement - For Outdoor Lawn Landscape Backyard Garden Farm Ranch Field
Chain Bar Tensioner Kit Fit For Chainsaw CS-400 CS400 CS-450 Adjust Adjustment Tensioner Adjuster Kit Assembly
Wlinfetity Chain Saw Chain Adjuster Tensioner Screws, 2 Sets (V651000001 V651000011) for CS-400 CS400 CS-450 Chainsaws, Black + Silver
Niceminiwall Chain Saw Chain Adjuster Tensioner Screws Kit (2 Sets) for CS-400, CS-450 Chainsaws – Compatible with Part Numbers V651000001, V651000011, V203000