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Please note that your serial number could be located on the outside frame of your unit.  On the dataplate, there should be your model number, serial number, and possibly even a date of manufacture needed in order to match up the correct parts diagram for your unit accurately.

Here are some examples of your serial number location:

Here is an example of where you can find your corresponding Challenge Machinery serial number to enter for correct parts matching.

H-6951-508 Challenge Screw - 5/16 X 1/2 Nylok Flt Pt Soc Set