have you looked at Manxnotebook - in particular at placenames of Michael ?
most likely west slope of Sartfell - you will need a map and I usually recommend the 2 sheet 2.5in to mile public rights of way map (get it from shop at Manx museum enquiries@mnh.gov.im) the rwo shoughlaige farms straddle the St Johns to Michael TT course about 2miles north of glen helen