Idler wheel size = platter speed?

[jrj90620]

I once had to carefully file down the motor shaft of a BSR aka Best (for) Scratching Records to slow it down. 33 and 45 ran way too fast.

Yeah,I worked for a BSR warranty station,during the 1970's.BSR was the largest manufacturer of turntables at the time.They didn't have a lot of quality control.Often,the idler wheel mechanism was bent and idler touching the 45 ramp of motor pulley.Had to bend to make it touch 33.Then they still made them to run fast.If someone complained,just used a sandpaper with motor running to sand down,for slower speed.