If you have ordinary frames and you want to move over to self spacing ones there are plastic self spacers available that you tack on to the sides of a frame at the top . they are usually sold by the likes of Thornes and are called frame converters or similar . If you go that route you need a box of frame pins as well .
I had 50 hives and 25 neuc boxes each hive had three supers and a brod box the neuc's had six frames .
It too ages to get them done but ended up much cheaper than buying ready shaped wooden ones .
There were some that slid over the end and amde spacers spacers but they often caused probs when they got brittle . They were normally in five different colours so anally impacted keepers could tell how old a frame was . I never bothered with them after seeing just how the wax moths loved laying their eggs under the plastic if it had warped up a bit &nbhow the emerging grub ate the end of the frame right through .
I purchased a manual panel pin inserter , it has a small magnet in theend , it holds a pin just great , you simply push the pin down into the holes in the coverter , as deep as you can through the hole , then drive it fully home with a pin hammer hitting down directly on whats left showing of the pin .
It was around £ 25 and well worth it , it's now nearly 18 yrs old and still gets used for setting various types of pins into wood etc.
I would not reccommend the metal converters nor the castleated self spacing strips that you tack on the top of the brood box or supers as they get rusty and are usually very sharp .
To get things easier for me I took out any castelated strips and fitted pairs of rails that looked a bit like an invered lowercase letter " j".
One hive I did for experimental purposes had 2.5mm T& E grey electrical cable clips pin taken out , inverted and reinserted then driven in the place where the rails should have been as built in spacers . ( As I had several thousad to play with ) .... they did work and were very cheap .
And all new supers and brood boxes I made were getting fitted with them , for it is just so easy to scrape propolis and wax off a straight frame . Wax moths didn't seem to like the plastic so stayed away instead of setting up an egg bank under them .