Hi, I need to buy a compression tester for the Honda BF 130. The plugs are deep set. I've tried one product with a rubber extension, and it had a rubber end - not a threaded end- and I couldn't get consistent pressure readings with it. Besides the rubber extension is not rigid enough to keep from possibly cross-threading it in the plug hole. I think I need a tester with a rigid extension that is threaded for the spark plug hole. I've checked all the products in the local auto parts stores, and did a Google search, but no luck. Any suggestions?