The bushing's only job is to hold in the auto safety pin. Once the gun is assembled the pin is captured anyway so it really is superfluous. Many stockmakers don't even bother to reinstall it on a restock unless the customer insists for originality. It is extra work for no purpose.
Many think that this bushing also serves to preserve tang depth, like pillar bedding in a rifle stock. This is incorrect because the bottom of the parker bushing doesn't generally bear against the triggerplate.
As long as your safety jacket is inletted correctly, your tang depth is OK and your holes are straight and of appropriate size you may forget about the bushing.
Hope this helps.
Dan May
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