Get an empty reel spool
Make a loop of Power Gum about 50mm or so long (lengths vary depending on spool size and make)
Put the knotted end on your empty spool with the loop on the bottom inner face of the spool facing out near to your spool's line clip
Then wind your line on as you would do normally so that the loop remains facing outwards but is trapped by the line as you wind it on
Once the spool is loaded you should end up with a loop of Power Gum sticking out from the base of the spool near to the line clip
To use it, cast out to the required spot then take the loop, put it over your line and clip the loop into the line clip
Your line should now be trapped by the Power Gum and if you need to free it it's simply a case of unclipping the Power Gum from the line clip
What folk forget is most “line clips” were designed for tidying your spoils and defo NOT for using as a distance marker when casting!
The old trick of using a piece of inner tube on the spool is still best method for maintaining distance marker in my opinion, I’ve been using it since mid 70’s when the late great Ivan Marks did an article on its use in his old Angling Times column.
In the days when you used to completely de-rig your rod and pop the end of the line in the clip l came up with a cunning time saving idea. I used to leave my rod made up and fold it up and secure with laccy bands. I took the spool off and popped the reel into my box. I put the folded down rod into a tube and the clipped up spool fitted onto a thin bolt with the same sized thread as the reel l had fitted to the tube cap. The spool was held in place by the clutch tensioner. Saved loads of time back then and protected your rods from damage.
Later on l just fitted a small cloth bag to the tube cap and popped the spool into that, much less engineering involved?