It also depends on the wood that is in the house cue. If it has a really light weight wood in the handle area you will not just be able to add a joint and new shaft and make it play like a custom cue. You would have to cut it behind the points and install a joint there to put the weight in the right place. Or you might core it and run a heavier wood through it. I have only done maybe a couple of dozen conversion cues in the last 20 years. However I have built a lot of full splice cues. The difference is I am not taking a house cue and converting it, but am starting with a blank that was spliced using similar methods to a house cue. This allows me to decide what pieces of wood will be used for the handle and forearm areas. So I can produce the balance that plays like I want a cue to play. Most older house cues were produced with fatter handles to give a playable weight. When thinned down to custom cue specs they become very light. When adding a huge weight bolt in the back like most do, they will not balance and play like a good custom cue is expected to play.