Sometimes it is inevitable to have to replace lacing but a lot of vintage gloves have breaks in the lacing but are otherwise intact. If there is enough length to deal with, I will scrape and taper 1/2'" of the broken ends with an exacto knife and apply Wilsonart 600 contact cement to the cleaned off areas and overlap the ends and bond them together. Most times the bonded section can be hidden in a tunnel web or a finger stall. I like to keep the vintage lace on the glove if possible rather than replace it.
One web lacing was broken on the glove below but otherwise was all original and pristine. The repaired overlapped section is in the finger stall and not visible. The thickness and width of the original lace was kind of unique to this glove and I thought a replacement would detract from the vintage look.