Use bearing b 127a to remove the quirk. specification:. C=17.5mm. B=9.5mm. R1=6.3mm. R2=4.8mm. Shank diameter=1/4 inch. Trend s/guided ogee 6.3mm rad tr_c 099x 8mmtc. Trend b/guided ogee 6.3mm rad tr_46/66x 1/4tc. spare parts::. Trend bearing 3/8 dia x 3/16 bore tr_b 95a. Trend spare part pack for m 3 & nc 5 screw tr_sp-i. Trend bearing 1/2 dia x 3/16 bore tr_b 127a.