ball guide rail that sits in the Pf itself?? These are normally able to be pulled out if need be and you can than restore the pf.

Several options - can glue it in, but i prefer Araldite to Super Glue - hey!! Super Glue aint that super believe me!

Id be more tempted to fill the hole and then redrill to a gauge smaller diameter. If you do this - dont use wood filler - its bloody crap and takes too long to dry. Builders bog is absolutley ideal for this as the rail can be inserted while its still curing and it then a perfect fit - and ready in 1 hr.

Or another stuff ive been using lately is a filler from the model shop - aint cheap but gees its good! Dries in like 2 mins max and is super smooth