Pardoned me, continued..
between the fork spring, some washers and cap. This spacer may be replaced with a section of similar diameter PVC pipe, squarely cut to a longer dimension, and reinstalled. This method will need to be repeated when new spings are installed.
Replace your fork fluid soon and often, many here like synthetic ATF.
Not to beat a dead horse, but new springs are superior, and xr400 fork springs have been given big thumbs-up.
Search for previous topics for a wealth of info.