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All arm-sizes can be fitted with a Knockstop ®. A  tie wrap, with a soft liner  or a ratchet strap is used to secure the elbow of the user in the holder. For maximal safety preferably two holders  on both elbows must be used.
This product can be purchased on the reknown 3D printing website www.treatstock.com:


 

Use a long tie wrap in a soft liner to secure each holder to the elbow.

Putting on the Knockstop® is easily  and quickly done by extending the tie wrap and then inserting the arm:


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Knockstop with more patient-friendly ratchet strap, with optional additional lock:

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