Introduction
This guide will outline how take apart your Proline strap lock and replace/repair the spring. I created this guide because my strap lock fell apart. I also had to replace the spring myself because the mechanism would not lock. This is not a guide to install the strap lock.. This document assumes you already have the strap lock installed on your strap and guitar.
Parts
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To take apart the strap lock, take the black ball cap and turn it counterclockwise.
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After you unscrew the ball cap, pull on the other side of the locking mechanism (opposite to the ball cap) to remove the spring and bar.
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You should have these two parts removed from the rest of the lock mechanism.
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If you do not have the spring or your spring is broken, you can get the spring described in the conclusion.
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Once the spring is on, reassemble your strap lock by inserting the locking mechanism into the underside of the housing.
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Then, screw back on the ball cap.
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Your strap lock should now function well, but make sure to hand test the locking strength before using your guitar. As for the replacement spring, it is hard to buy a spring of this size individually. The dimensions of the spring are approximately as follows:
Inner Diameter: 4.5 mm (.177 in)
Outer Diameter: 5.3 mm (.209 in)
Free Length: 7.8 mm (.307 in)
As stated in step 2, if you cannot get a spring of this exact size, it is possible to cut a spring from a pen to length, and with a little stretching get it to the right dimensions.
