# How to use SPRs?

**URL:** <https://forums.yoyoexpert.com/t/how-to-use-sprs/75618>\
**Category:** Yo-Yo Mods and Maintenance\
**Created:** [July 6, 2015, 12:32am UTC](https://forums.yoyoexpert.com/t/how-to-use-sprs/75618 "2015-07-06T00:32:43Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![skyguy01](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@skyguy01](https://forums.yoyoexpert.com/u/skyguy01)\
**Post date:** [July 6, 2015, 12:32am UTC](https://forums.yoyoexpert.com/t/how-to-use-sprs/75618/1 "2015-07-06T00:32:43Z")

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I bought a set of C bearing SPRs and was wondering how to put them into a profly so I could have a thing but unresponsive pocket yoyo… any comments will help.

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**Author:** ![jhb8426](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/jhb8426/32/631_2.png) [@jhb8426](https://forums.yoyoexpert.com/u/jhb8426)\
**Post date:** [July 6, 2015, 2:42am UTC](https://forums.yoyoexpert.com/t/how-to-use-sprs/75618/2 "2015-07-06T02:42:40Z")

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Remove the wood axle, put one spr in each half. The recess may be a bit deep and have to be shimmed, unless it completely covers the recess altogether.

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**Author:** ![skyguy01](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@skyguy01](https://forums.yoyoexpert.com/u/skyguy01)\
**Post date:** [July 6, 2015, 6:16am UTC](https://forums.yoyoexpert.com/t/how-to-use-sprs/75618/3 "2015-07-06T06:16:23Z")

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The axle is too short ☹

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**Author:** ![jhb8426](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/jhb8426/32/631_2.png) [@jhb8426](https://forums.yoyoexpert.com/u/jhb8426)\
**Post date:** [July 6, 2015, 4:41pm UTC](https://forums.yoyoexpert.com/t/how-to-use-sprs/75618/4 "2015-07-06T16:41:10Z")

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> [@](#):
>
> Most Duncans  
> 4mm x .7mm pitch bolt. Length varies with model.

[Common Yoyo Axle Sizes](http://yoyoexpert.com/forums/index.php/topic,19914.0.html)

Just go to the hardware store and buy a screw of the proper size.

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<div class="post-metadata">

**Author:** ![skyguy01](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@skyguy01](https://forums.yoyoexpert.com/u/skyguy01)\
**Post date:** [July 6, 2015, 9:42pm UTC](https://forums.yoyoexpert.com/t/how-to-use-sprs/75618/5 "2015-07-06T21:42:30Z")

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What pads do you use for SPRs?

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**Author:** ![jhb8426](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/jhb8426/32/631_2.png) [@jhb8426](https://forums.yoyoexpert.com/u/jhb8426)\
**Post date:** [July 6, 2015, 10:12pm UTC](https://forums.yoyoexpert.com/t/how-to-use-sprs/75618/6 "2015-07-06T22:12:06Z")

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At the time they were introduced dif pads or duncan friction stickers were suggested. Most any similar sized pad will work.

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<div class="post-metadata">

**Author:** ![skyguy01](https://avatars.discourse-cdn.com/v4/letter/s/e56c9b/32.png) [@skyguy01](https://forums.yoyoexpert.com/u/skyguy01)\
**Post date:** [July 6, 2015, 10:25pm UTC](https://forums.yoyoexpert.com/t/how-to-use-sprs/75618/7 "2015-07-06T22:25:37Z")

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Thank you for being such a big help jhb ;D

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**Author:** ![jhb8426](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/jhb8426/32/631_2.png) [@jhb8426](https://forums.yoyoexpert.com/u/jhb8426)\
**Post date:** [July 6, 2015, 10:38pm UTC](https://forums.yoyoexpert.com/t/how-to-use-sprs/75618/8 "2015-07-06T22:38:04Z")

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That’s why they pay me so well. :wink: