こびりついた虫ゴム
http://out0.blog75.fc2.com/blog-entry-250.html
自転車用新型バルブ(スーパーバルブ)を使う
http://www.geocities.jp/taka_laboratory/20060205-Bicycle-Valve/20060206-Super-Valve.html
http://www.geocities.jp/taka_laboratory/20060205-Bicycle-Valve/20090622-super-valve-05.jpg
http://www.geocities.jp/taka_laboratory/20060205-Bicycle-Valve/20090622-super-valve-06.jpg