You can place a small finish nail through the spindle and then "set" it with a nail set.
Dynamat
balance it
The heat shield on top of the converter may have broken loose. it can be repaired. If the rattling is inside the converter it must be replaced.
Are spindles bipolar
The best way to stop the rear brakes on a Mazda 626 from rattling would be to replace them. New brakes can cost between $20 and upwards of $100 depending on the quality of the brakes.
Replace it.Replace it.
the muffler rattling? the muffler rattling? the muffler rattling?
There are a few things that might cause an air conditioner to make a rattling noise. It could be that the there is dirt and debris in the cabinet. If this is the case, cleaning the cabinet should stop the rattling. The reason could also be loose panels on the cabinets. The fan could also be bent and no longer straight.
if its a front wheel drive vehicle then it could be the axels
More than likely the heat shield is cracked or loose. Repair or tighten it.
tighten torx screws holding glass to sunroof hinge. this is most common cause.
Could be any number of things. You are going to have to locate the source of the rattle in order to stop it.