there are mechanical tolerances in both the STELLA shank as will as the new knob and retainer
the original knob must be removed from the reel handle
250 & 400 Round BaitCaster Reels
Then tighten the screw to the point where the screw is snug and then back off the screw just enough to permit free rotation
Direct Replacement T-Bar Knobs fits Penn Int'l 12V 12VS 12VSX 16VS 16VSX Reels - KNOB TYPE:T-Bar (3.75") Aluminum there are mechanical tolerances inDirect Replacement No Drilling Needed New Light Weight Power T Bar Knob For PENN Int'l Reels 12 & 16 Series Reels 12V, 12VS, 12VI, 12VIS, 12VISX, 12VISXS, 16VIS, 16VISS, 16VISX, 16VISXS 12V 12VS, 12VSX, 16VS & 16VSX 2 Speed Reels. 30 & 50 Series Reels 30S, 30SW, 30T, 30TW, 30VSW (Newer), 30VSW (Older), 30VSX, 30VW (Older), 30VW (Newer), 50S, 50SW, 50T, 50TW, 50VSW (Newer), 50VSW (Older), 50VSX, 50VW, 80VSW VI Series Reels 12VIS, 12VISX, 12VISXS,