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Comments
Insufficient foam packing beneath the pickup. It ought to push the pickup firmly against the heads of the height adjustment screws.
Possibility #2
The pickup coil was not wax potted properly.
Possibility #3
A previous owner custom ordered the offending pickup with little or no wax.
Possibility #4
A previous owner changed the bridge position pickup for an inferior replacement.
Thanks for the help @Funkfingers.
Are the screws holding the pickup tightly to the body? That might be another source of microphonics if the pickup can vibrate.
No, I can push the pickup down as the foam is quite loose. I've tightened the screws as much as possible, but there's still 3-4mm movement. I guess I could try some small wood blocks under the foam.
Readjust the pickup to its previous height setting.
If the guitar still howls, squeals, whistles or runs into feedback whenever the strings are not palm muted, it probably wants another dip in potting wax.
As @Funkfingers says, try some better foam etc. first. With a bit of luck that might fix it. If not, and assuming you can solder, it definitely makes more sense, as he says, to just send the pickup, both from a cost and from the "something going catastrophically wrong" point I made above...
Formerly TheGuitarWeasel ... Oil City Pickups ... Oil City Blog 7 String.org profile and message