big change when he noticed his customers buying a lot of beer tap handles, products that weren't even part of the original plan. >> when you have customers calling every day, it's hard to turn them away. nice people. they want to give you money. that's a good thing. >> mark never could have guessed what his best selling product would be when he started his small business in 1981. >> 20, 30 years ago, beer taps didn't play that big a part in the retailing of beer. and my feeling is that now it's a huge part. i think we have been very lucky to have this marked find us. this market grew around us. >> the owner of mark supick and company in baltimore, maryland, said his clients are the reason he decided to sell his now popular custom designed wooden beer tap handles. >> before this, the customer demand wasn't that high. it came in the back door, it was an aside, and we made them because it was a good fit for