# Interrupt a session

**URL:** <https://forum.onefinitycnc.com/t/interrupt-a-session/14144>\
**Category:** Original/PRO Series (Buildbotics) (Gen 1)\
**Created:** [July 15, 2022, 1:01pm UTC](https://forum.onefinitycnc.com/t/interrupt-a-session/14144 "2022-07-15T13:01:43Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [July 19, 2022, 4:28pm UTC](https://forum.onefinitycnc.com/t/interrupt-a-session/14144/15 "2022-07-19T16:28:49Z")

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Hey David,

> [@Arzt](#):
>
> Mechatron sent a proposal that included a spindle holder and an alternative. I had ordered a spindle holder from Onefinity with the machine, and I don’t know the compatibility of its mounting holes with those of the Mechatron options.
> 
> One of Mechatron’s holders (90 Eur) has mounting holes in a grid of 125 mm. The other (179 Eur) has “two bore holes…for dust extraction, etc.” I don’t see an advantage in buying their spindle holder, but while I’m finishing up the deal, I wanted to ask whether I’m overlooking anything.

It is not possible to attach third-party spindle holders to the Onefinity, you are forced to use their stock 65 mm or their [optional spindle 80 mm mount](https://www.onefinitycnc.com/product-page/80mm-spindle-mount), **except if you replace the entire Z assembly:**

- [Universal Z Axis Assembly](https://forum.onefinitycnc.com/t/universal-z-axis-assembly/4415)
- [Has anyone replaced their Z axis assembly for greater travel?](https://forum.onefinitycnc.com/t/has-anyone-replaced-their-z-axis-assembly-for-greater-travel/9028)

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