# Duncan Pro Z with Large Konkave Bearing spacers?
**URL:** https://forums.yoyoexpert.com/t/duncan-pro-z-with-large-konkave-bearing-spacers/71740
**Category:** Looking for Help/Recommendation
**Created:** [January 5, 2015, 2:28am UTC](https://forums.yoyoexpert.com/t/duncan-pro-z-with-large-konkave-bearing-spacers/71740 "2015-01-05T02:28:29Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Ripcord](https://forums.yoyoexpert.com/u/Ripcord)
#### Post date: [January 5, 2015, 2:28am UTC](https://forums.yoyoexpert.com/t/duncan-pro-z-with-large-konkave-bearing-spacers/71740/1 "2015-01-05T02:28:29Z")
Howdy!
While I am sure to have more yo-yo’s in my near future, I am currently using my Duncan Pro Z more then my Speedaholic for learning new tricks. It’s just better for me personally.
So I was thinking of trying to make it better, it comes stock with a small 8 ball bearing in it, but you can buy a Mod Spacer upgrade that has a Dif-E-Yo konkave bearing size C in it.
Located here [Duncan – YoYoExpert](http://shop.yoyoexpert.com/product/738/Duncan-Mod-Spacers)
Does anyone have any experience with those larger Mod Spacers in their Pro Z/other Duncan? Is it a decent upgrade?
I have already purchased it from this site, I was just wondering how others experiences with them have been.
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### Author:  [@Ripcord](https://forums.yoyoexpert.com/u/Ripcord)
#### Post date: [January 11, 2015, 7:57pm UTC](https://forums.yoyoexpert.com/t/duncan-pro-z-with-large-konkave-bearing-spacers/71740/2 "2015-01-11T19:57:23Z")
Well I have tried out the upgrade kit for the mod spacers. The concaconcave bearing is great but the mod spacers themselves suck.
Unless you want a generic concave bearing for 11 bucks I would stay away from this deal