Do you have any Android phone?
If so you can use the free Strobily strobe app.
Download a strobe suitable your TT's main frequency from Vinyl Engine then print and cut it round.Put it on your TT over a LP and trim your speed under phones flashing light also at the same time playing the outer parts of LP to compensate stylus drag.
It could help if we knew your TT.
Good Luck,
PS:I am sure there are also apps for iPhones, so search if you have one.
If so you can use the free Strobily strobe app.
Download a strobe suitable your TT's main frequency from Vinyl Engine then print and cut it round.Put it on your TT over a LP and trim your speed under phones flashing light also at the same time playing the outer parts of LP to compensate stylus drag.
It could help if we knew your TT.
Good Luck,
PS:I am sure there are also apps for iPhones, so search if you have one.