(defun c:foo (/ _c ad b bd bn d e p p2 s sc)
  ;; RJP » 2018-12-10
  (defun _c (p r) (entmakex (list '(0 . "circle") (cons 10 p) '(8 . "detail") (cons 40 r))))
  (cond
    ((and
       (setq p (getpoint "\nPick center of detail: "))
       (setq d (getdist p "\nEnter radius: "))
       (setq p2 (getpoint p "\nPick point to place detail: "))
       (setq sc	(cond ((getint "\nEnter scale of detail <2>: "))
		      (2)
		)
       )
       (setq s (ssget "_C" (list (+ (car p) d) (- (cadr p) d)) (list (- (car p) d) (+ (cadr p) d))))
       (setq s (vl-remove-if 'listp (mapcar 'cadr (ssnamex s))))
       (setq s (vl-remove-if
		 '(lambda (x) (wcmatch (cdr (assoc 0 (entget x))) "INSERT,MTEXT,TEXT,DIMENSION"))
		 s
	       )
       )
     )
     (setq bn (strcat "Detail_" (itoa sc) "_" (rtos (getvar 'cdate) 2 12)))
     (setq ad (vla-get-activedocument (vlax-get-acad-object)))
     (setq bd (vlax-invoke (vla-get-blocks ad) 'add p bn))
     (vlax-invoke ad 'copyobjects (mapcar 'vlax-ename->vla-object s) bd)
     (setq b (vla-insertblock (vla-get-modelspace ad) (vlax-3d-point p2) bn sc sc sc 0.))
     (_c p d)
     (_c p2 (* d sc))
     (vla-put-layer b "detail")
     (command "_.polygon" 100 p2 "_I" (* d sc))
     (setq e (entlast))
     (command "_.xclip" (vlax-vla-object->ename b) "" "_New" "_Select" e)
     (entdel e)
     (entmakex (list '(0 . "line")
		     (cons 10 (polar p (angle p p2) d))
		     (cons 11 (polar p (angle p p2) (- (distance p p2) (* d sc))))
		     '(8 . "detail")
	       )
     )
     (entmakex
       (list '(0 . "TEXT")
	     '(100 . "AcDbEntity")
	     '(67 . 0)
	     '(8 . "detail")
	     '(100 . "AcDbText")
	     (cons 10 (setq p2 (polar p2 (* pi 1.5) (+ (* d sc) (* 2.5 (getvar "TEXTSIZE"))))))
	     (cons 40 0.125)
	     (cons 1 (strcat "sCALED:" (itoa sc) "x"))
	     '(50 . 0.)
	     '(41 . 1.)
	     '(51 . 0.)
	     '(71 . 0)
	     '(72 . 1)
	     (cons 11 p2)
	     '(100 . "AcDbText")
	     '(73 . 0)
       )
     )
    )
  )
  (princ)
)
(vl-load-com)
	I tried to somewhat translate your code. It could still use some cleanup but hopefully will give you a working base.