# Form 4

* Backforce
* Backforce Plus **\*[Extra control knob gets in the way - See Joystick/HOTAS Chair Mount manual, page 8]**
  * Note: Backforce One Plus armrest bolts have increased from M6 to M8 and might not be included with the FORM4 screw pack.


[monstertech_chair_mount_form_4.pdf 95438](https://docs.monster.tech/api/files.get?sig=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJrZXkiOiJ1cGxvYWRzL2QxYzM3NWE1LWZkMTEtNGU4Ni1iMTFhLTAwMGY0ZGMzYTNlZS82N2U2MzVhNC0xMzA4LTQwOWQtOGY0ZC0zZGY2N2ViMmVmZjYvbW9uc3RlcnRlY2hfY2hhaXJfbW91bnRfZm9ybV80LnBkZiIsInR5cGUiOiJhdHRhY2htZW50IiwiaWF0IjoxNzkyNzAxOTAwLCJleHAiOjE3OTI3ODgzMDB9.HNFDtNP2dAMAeOLv7OaA3urLFStFd5Pv25bNrlYuyg4)

[monstertech_chair_mount_form_4.pdf 95438](https://docs.monster.tech/api/files.get?sig=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJrZXkiOiJ1cGxvYWRzL2QxYzM3NWE1LWZkMTEtNGU4Ni1iMTFhLTAwMGY0ZGMzYTNlZS9kNjBhOGJmMS0zNjcxLTQ2ODUtYWRjNS04NDEwNzEzOGQyMTQvbW9uc3RlcnRlY2hfY2hhaXJfbW91bnRfZm9ybV80LnBkZiIsInR5cGUiOiJhdHRhY2htZW50IiwiaWF0IjoxNzkyNzAxOTAwLCJleHAiOjE3OTI3ODgzMDB9.xP8WgyGoqWEUQJaUxoU2KWefhTA5yXUk7JUklPB5g6U)

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**Documents**

- [FAQ](https://docs.monster.tech/s/manuals/doc/faq-djldmh1UPE)
- [Instruction Manuals](https://docs.monster.tech/s/manuals/doc/instruction-manuals-ffOKfWkUkE)
- [Chair Mount Compatibility](https://docs.monster.tech/s/manuals/doc/chair-mount-compatibility-ufimFpkezv)
- [Software](https://docs.monster.tech/s/manuals/doc/software-4drRBZzipW)
- [Contact](https://docs.monster.tech/s/manuals/doc/contact-dSKwxWOiaX)
- [Imprint](https://docs.monster.tech/s/manuals/doc/imprint-6fxDraKotd)