So I've been looking into restoring pipes and I see the deals for bowls only. Looks like you can get a good deal on a lot of bowls this way. I'm wondering if it's worth/easy to replace stems if your not 100% sure of the maker. I can find plenty of sites that have the stems but they come in tons of sizes and shapes. Is it a matter of personal preference for shape and then just sanding down to exact fit? Basically I'm looking to add to my collection/rotation without spending $60-70 for every new pipe. My thoughts are just cleaning up the bowls and then measuring the opening of the shank and finding stems with tenons of similar but larger size to sand down? Or am I way off and need to read and do a lot more research?