This is an age old problem with Td 124s. The table was designed for commercial use which meant immediate cuing of records which it does with a clutch that lifts the very light outer platter off the heavy inner platter which keeps rotating while the other is stationary. The outer platter is soft metal and can easily be deformed which is what has happened here.
I hate to be the one to tell this to the OP but this is a terrible design for a modern audiophile turntable and should be kept aside as a interesting side path in audio antiquity. Time to get a new turntable. Do yourself a favor and steer clear of antiques. Get yourself a modern up to date design. If you do not want to see your tonearm bob at all get a table with vacuum clamping.