There are three different angles...straight 90 degree, and then two different angles that I can't remember the measurements. I call them slight angles and greater angles. Maybe they are 45 and 60 degrees? the slight or greater degree angled receivers were used on the bass drums depending on the size of the bass drum, how high up on the shell they were mounted, and the lextended ength of the spur rods.

I THINK they are 45-60-75 degrees........

Actually, they are considered STRAIGHT (90 degrees), 75 and 60. The 60-degree was also known as the "off-center" mount and also for bass drum spurs on 18" and 20" bass drums. The "off-center" mounting can generally be observed for the Swivomatic tom arm on the Headliner kit.

The 75-degree mount was for "right or left side" mounting of the Swivo tom arm. A good example of this location is seen on the Celebrity kit and most other bass drums 22" and larger. The 75-degree mount was also used for spurs on 22" and larger bass drums.

Hope this helps and doesn't cause more confusion! LoLoLoLo

OK.......thanks for setting the record straight!

I have too much minutia in my head! Sometimes I don't know how I sleep at night!

Idrum4fun, thanks for the details. I knew what I meant, but just didn't remember the details. Perhaps the most inventive and useful feature that Joe Thompson designed in to the Swivomatic hardware is the universality of the mounting plates. Switching out various mounting devices greatly expanded the versatility of drum set configurations. I once had a Rogers part that I treasured. However, I traded this little gem for something worth a good deal of money. The item I had was the highly sought after Swivomatic "Oops plate". It is a chrome plated blank plate with the four bolt holes. That plate is used to cover up the place where an unused Swivomatic mounting plate had been installed. The plate does this in an attractive and decorative manner. I gave serious thought to having something engraved on the plate when I had attached it to where a double tom mount had been in the front/center position on the bass drum. But, I then returned to more rational thinking.

Thanks for clearing up the purpose of the rarely seen Swivo blank plate! From the one example I've personally seen of this item , it appeared that it was being used to prevent the bottom rim of the mounted tom from damaging the the portion of the bass wrap on which it was resting. I thought this was it's intended purpose, but from your description of this plate's decorative purpose, it was probably covering up the original, single tom bass mount. I love this minutia!

Mike C

Here's a picture of one of the ooops plates (blank plate) on a bass drum. Picture is courtesy of Bobby Chiasson of the Drum Farm.

An excellent description of the "oops" plate!