YYE has some tips that say for throwback does throwback use different tip than the acrobat. Looking for any info on these tips ,or ideas. Thanks
EDIT: I remembered wrong: the Acrobat and Throwback tips are not compatible. The Acrobat tip has a flat shelf while the Throwback tip has a beveled shelf.
In addition, the fixed-tip-only purple Acrobat might not be compatible with other Acrobats. That top was initially designed for a one way bearing but it did not work out.
You can switch the tips between the two tops, except (I believe) for the purple fixed tip-only Acrobat (the one Miguel is selling).By the way, the Acrobat did not come with the rounded tip option of the Throwback.