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</head><body><p style="font-size:12pt;font-family:helvetica,arial,sans-serif;color:#333333;" class="default-style">Pretty sure the 3 plugs are 1/2-20. TRF sells a stick of 3 of the correct plugs for less than $6. Part no. Is PU1404/3. </p><p style="font-size:12pt;font-family:helvetica,arial,sans-serif;color:#333333;" class="default-style"><br></p><p style="font-size:12pt;font-family:helvetica,arial,sans-serif;color:#333333;" class="default-style">Ed Woods</p><p style="font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"></p></body></html>